Clinical Guideline/Formulary Document - Pharmacy Department Medicines Management Services - Mersey Care NHS Foundation

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Clinical Guideline/Formulary Document
Pharmacy Department Medicines Management Services

BIPOLAR AFFECTIVE DISORDER [BPAD]
Introduction

   Bipolar Affective Disorder [BPAD] is a chronic, recurrent cyclical mood disorder
   associated with high levels of suffering, occupational dysfunction, impaired social life and
   relationships, as well as increased morbidity and mortality.
   Bipolar disorder is often co-morbid with a range of other mental disorders (for example,
   psychosis, substance misuse, anxiety disorders, personality disorders and ADHD) and
   this has significant implications for both the course of the disorder and its treatment.
   The treatment of BPAD is based primarily on psychotropic medication to reduce the
   severity of symptoms, stabilise mood and prevent relapse. The treatments are
   determined by the phase of illness and subtype of disorder. Individual variation in
   response to medication will often determine the choice of drug, as will age, side effects,
   interactions and associated cautions, child-bearing potential, previous history, medical
   comorbidities and individual preferences. Clear, written information about bipolar
   disorder, treatment options, benefits and side effects should be discussed and provided
   to service users and carers.
   Psychological interventions developed specifically for bipolar disorder or high-intensity
   psychological interventions should be offered.

Monitoring

   BPAD is associated with poor physical health and drug treatments can add to this.
   NICE recommends a physical health check for people with bipolar disorder, performed at
   least annually, to include weight or BMI; diet, nutritional status and level of physical
   activity; cardiovascular status, including pulse and blood pressure; metabolic status,
   including fasting blood glucose, glycosylated haemoglobin (HbA1c), prolactin, blood lipid
   profile, liver function. Renal and thyroid function and calcium levels are necessary, for
   people taking long-term lithium.
   People identified as having rapid or excessive weight, gain, hypertension, diabetes, and
   abnormal lipid levels, obesity (or risk factors) or are physically inactive should be
   managed in line with the relevant NICE guidance.
   The impact of alcohol, tobacco and illicit drugs on physical and mental health and
   potential drug interactions with medication should be discussed.

Prescribing Advice

   Service users and carers (if appropriate) should be provided with suitable information on
   the likely benefits and side effects of medication and their views on the choice of
   medication should be considered.
   During review of treatment, service users should be specifically questioned about the
   efficacy of the medication, functioning, concordance and adverse affects. Side effects
   should be documented in the case notes and reported via the Yellow Card Scheme.
   Prescribe a dose that is appropriate for the phase and severity of the illness and
   consider age and comorbidities. Do not routinely prescribe a dose above the maximum
   recommended in the British National Formulary [BNF] or Summary of Product
   Characteristics [SPC]. A review of doses prescribed should be on going.

Mersey Care Clinical Guideline/Formulary Document          Updated:     Jan 2019
Bipolar Affective Disorder                                 Next Review: Jan 2021       1|
Be aware of potential interactions of between mood stabilisers, antipsychotics and
   antidepressants used for bipolar disorder and also with other prescribed medication.
   For advice on DRIVING and health conditions, see DVLA.
   It is illegal to drive if medication impairs driving ability. See Drugs and driving: the law.
   It is an offence for a person to drive with certain levels of some medications in the blood.
   See https://www.gov.uk/government/collections/drug-driving#table-of-drugs-and-limits
   for up to date information.
   A guide to support medical professionals in assessing fitness to drive can be found at
   https://www.gov.uk/government/publications/assessing-fitness-to-drive-a-guide-for-
   medical-professionals

   Antipsychotics
      The antipsychotics haloperidol, olanzapine, quetiapine and risperidone are
      recommended by NICE for bipolar disorders. Aripiprazole (for up to 12 weeks) is
      also an option for moderate to severe manic episodes in young people aged 13 and
      older with bipolar I disorder. Antipsychotic treatment should not routinely be
      continued antipsychotic in young people for longer than 12 weeks.
      Baseline tests
      o Weight or BMI, pulse, blood pressure, fasting blood glucose or HbA1c, blood lipid
          profile and ECG (for inpatient or if specified by manufacturer or where clinically
          appropriate)
      Ongoing monitoring
      o Side effects, response to treatment
      o Pulse and blood pressure after each dose change
      o Weight or BMI weekly for the first 6 weeks, then at 12 weeks
      o Blood glucose or HbA1c and blood lipid profile at 12 weeks
      o Responsibility for monitoring may be transferred to primary care after 12 months
          or when the patient’s condition is stabilised
      Do not start regular combined antipsychotic medication, except for short periods (for
      example, when changing medication)
      Discontinue antipsychotics gradually over at least 4 weeks to minimise risk of
      relapse.

   Lithium
       Pre-treatment tests:
       o Weight/BMI; U&Es and Cr, eGFR, Calcium, TFTs, FBC, ECG – good practice
          and (in those with cardiovascular disease or risk factors).
       o Exclude pregnancy.
       o Check interactions.
       Ongoing monitoring:
       o Plasma lithium levels 1 week after starting lithium and 1 week after every dose
          change, and weekly until the levels are stable then plasma lithium every 3
          months; U&E including calcium, eGFR; TFTs every 6 months; Weight and BMI.
       o Monitor for symptoms of neurotoxicity, including paraesthesia, ataxia, tremor and
          cognitive impairment, which can occur at therapeutic levels of lithium
       Narrow therapeutic index:
       o Aim for lithium level between 0.4 – 1.0mmol/L (elderly 0.4-0.8mmol/L);
       o Bloods to be taken 12 hours post dose.
       o Toxicity is more common at levels above 1mmol/L. Signs of lithium toxicity
          include: CNS effects including muscle weakness, muscle twitching, drowsiness
          and coarse tremor and gastrointestinal effects including increasing anorexia,
          nausea and diarrhoea.

Mersey Care Clinical Guideline/Formulary Document            Updated:      Jan 2019
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Ongoing verbal and written information:
       o The National Patient Safety Agency (NPSA) Lithium Therapy pack should be
          given to each person commencing lithium. The pack contains a purple patient
          information booklet, a monitoring booklet to record blood results and an alert card
          to be carried by the patient.
          https://webarchive.nationalarchives.gov.uk/20100312174238/http://www.nrls.nps
          a.nhs.uk/resources/search-by-audience/community-pharmacy-
          staff/?entryid45=65426&cid=898358&p=1
Prescribing Lithium:
   Lithium should be prescribed by drug name AND by brand. Preparations vary widely in
   bioavailability; changing the preparation requires the same precautions as the initiation of
   treatment

       Interactions with other drugs:
       o Due to lithium’s relatively narrow therapeutic index, pharmacokinetic interactions
           with other drugs can precipitate lithium toxicity.
       o Non Steroidal Anti inflammatory drugs (NSAIDS) such as diclofenac, ibuprofen,
           naproxen, ketoprofen can increase serum levels of lithium by up to 40%.
       o Angiotensin Converting Enzyme inhibitors (ACE Inhibitors) such as captopril,
           enalapril and ramipril can cause up to a four-fold increase in lithium levels over
           several weeks
       o Thiazide diuretics such as bendroflumethiazide can cause an up to four -fold
           increase in lithium levels. This is usually apparent in the first 10 days of
           treatment.
       o See SPC or BNF for further information on interactions.
       Stopping lithium:
       o If lithium is to be discontinued, the dose should be reduced gradually over a
           period of at least four weeks (preferably up to 3 months). Individuals should be
           warned of the risk of relapse if discontinued abruptly.
       Teratogenicity: Possible increase risk of cardiac defects and neonatal complications.
       Avoid in pregnancy and women planning pregnancy.
   Valproate
      Pre- treatment tests: Baseline FBC, LFTs, weight and BMI
      Ongoing monitoring: Weight/BMI, FBC and LFTs should be repeated after 6 months
      then annually. Albumin and clotting time should be checked if changes in LFTs;
      check interactions; Monitor for signs and symptoms of blood dyscrasias and liver
      disorders, sedation, tremor and gait disturbances.
      Stopping valproate: Reduce dose gradually over at least 4 weeks to reduce relapse.
      Teratogenicity: Valproate is a major human teratogen. Medicines containing
      valproate taken in pregnancy can cause malformations in approximately 10% of
      babies and developmental disorders in 30–40% of children after birth. Valproate is
      contraindicated in pregnancy and must not be prescribed in pregnancy. In addition,
      valproate must no longer be prescribed to women or girls of childbearing potential
      unless the terms of the pregnancy prevention programme (PPP) are met and only if
      other treatments are ineffective or not tolerated, as judged by an experienced
      specialist. Women or girls of childbearing potential prescribed valproate should have
      a Risk Acknowledgement Form completed and signed at least annually. See MHRA
      drug safety alert.
      The Valproate Pregnancy Prevention Programme is supported by a Patient Guide, a
      Guide for Healthcare Professionals, Annual Risk Acknowledgement Form, a Patient
      Card and Stickers with warning symbols. See MHRA guidance.
      Be aware of potential interactions between valproate and other mood stabilisers
      particularly carbamazepine and lamotrigine, olanzapine and fluoxetine.

Mersey Care Clinical Guideline/Formulary Document           Updated:      Jan 2019
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Carbamazepine
      Pre-treatment tests: U&Es, FBC, LFTs. Baseline measure of weight desirable
      Monitoring: Weight, FBC, platelets, LFTs baseline and periodically, U&E/Creatinine.
      Usually every 6 months.
      Interactions with other drugs:
      o Carbamazepine is a potent inducer of hepatic cytochrome P450 and is
          metabolized by CYP3A4. Plasma levels of most antidepressants, antipsychotics,
          benzodiazepines, methadone, theophylline and oestrogens can be reduced by
          carbamazepine resulting in treatment failure.
      o The dose of the combined oral contraceptive should be adjusted accordingly
          when prescribing an enzyme - inducing drug such as carbamazepine. The
          efficacy of the contraceptive pill is reduced. Advise that barrier methods of
          contraception should also be used for maximal contraceptive effect.
      o Drugs that inhibit CYP3A4 such as diltiazem, erythromycin, cimetidine and some
          SSRI’s will increase carbamazepine plasma levels and may lead to toxicity.
      Teratogenicity – Increase risk of developmental disorders and congenital
      malformations.
      Stopping carbamazepine: Reduce dose slowly over at least one month.
      Risk of serious skin rashes with carbamazepine is greater in people of Thai or Han
      Chinese, Japanese or European descent.

   Lamotrigine
      Pre-treatment tests: FBC, U&Es, LFTs
      Monitoring: Serious skin rashes; Follow recommended dose titration in BNF or SPC.
      Dosage recommendations are complex, particularly when lamotrigine is used with
      other anticonvulsant drugs.
      Interactions with other drugs
      Lamotrigine can interact with valproate and fluoxetine
      Teratogenicity – Lamotrigine is a folic antagonist and may increase the risk of
      orofacial clefting. High dose (5mg daily) folic acid is recommended
      Stopping lamotrigine: Reduce dose slowly over at least 4 weeks to reduce relapse.

   Other
      Topiramate and gabapentin should not be used (off-label) to treat bipolar disorder.

Pharmacological Treatment of Bipolar Disorder - Principles of Management

Bipolar Mania or Hypomania
   People who develop mania or hypomania and are not currently prescribed an
   antipsychotic or mood stabiliser should be offered haloperidol, olanzapine, quetiapine or
   risperidone, depending on preference, advanced statements, comorbidity, previous
   response and side effects.
   If the first antipsychotic is poorly tolerated or ineffective at the maximum licensed dose,
   an alternative antipsychotic from the drugs listed above should be offered.
   If an alternative antipsychotic is not sufficiently effective at the optimal dose, consider
   adding lithium. If adding lithium is ineffective, or if lithium is not suitable, consider adding
   valproate instead. Valproate must not be prescribed in pregnancy. In addition, valproate
   medicines must no longer be used in women or girls of childbearing potential unless a
   Pregnancy Prevention Programme (PPP) is in place. Women or girls or childbearing
   potential prescribed valproate should have a Risk Acknowledgement Form completed
   and signed at least annually.
   If a person is already prescribed an antidepressant, consider withdrawing the
   antidepressant at onset of manic or hypomanic episode, abruptly or gradually, as
   appropriate and initiate an oral antipsychotic, as above.

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Short term use of benzodiazepines may be considered to manage severe agitation.
   People presenting with a mixed affective states should be managed as above and
   monitored for the emergence of depression
   If monotherapy proves ineffective, consider using a combination of an antipsychotic with
   mood stabiliser(s).
   Carbamazepine should not be used routinely, but is licensed for people who are
   intolerant of lithium or for whom lithium is ineffective
   Lamotrigine is not recommended for treatment of acute manic or depressive episodes.

Acute manic or hypomanic episode while already taking antimanic medication
   For people already taking lithium who develop a manic or hypomanic episode, the
   plasma lithium level should be checked and the dose optimised. Adding haloperidol,
   olanzapine, quetiapine or risperidone to lithium should be considered, depending on the
   person’s preference and previous response to treatment.
   For people already taking valproate* or another mood stabiliser, consider increasing the
   dose, up to the maximum BNF dose, depending on clinical response and side effects. If
   there is no improvement, consider adding an antipsychotic, as above.
   If a service user already taking an antipsychotic experiences a manic episode, the dose
   should be checked and increased if necessary. An alternative antipsychotic may be
   tried. If there is no improvement, lithium or valproate* should be added.
   *Valproate must not be prescribed in pregnancy. In addition, valproate medicines must
   no longer be used in women or girls of childbearing potential unless a Pregnancy
   Prevention Programme is in place. Women or girls of childbearing potential prescribed
   valproate should have a Risk Acknowledgement Form completed and signed at least
   annually.
   Carbamazepine is licensed for the treatment of bipolar disorder in people who are
   intolerant of lithium or for whom lithium is ineffective. If a service user on carbamazepine
   presents with mania, the dose should not be routinely increased – an antipsychotic
   should be considered. Interactions are common and dose adjustment may be required.
   Long-term treatment should be discussed with the service user/carer within 4 weeks of
   resolution of symptoms. If appropriate, treatment for acute episodes can continue for a
   further 3–6 months, and then should be reviewed.

Bipolar Depression
   People with bipolar depression should be offered an evidence-based psychological
   intervention developed specifically for bipolar disorder or a high-intensity psychological
   intervention, such as cognitive behavioural therapy, interpersonal therapy or behavioural
   couples therapy, and monitored for clinical signs of mania or hypomania or deterioration
   of depressive symptoms.
   People who develop moderate or severe bipolar depression and are not taking a drug to
   treat their bipolar disorder should be offered fluoxetine combined with olanzapine or
   quetiapine on its own, depending on preference and previous response. If preferred,
   olanzapine without fluoxetine or lamotrigine can be considered. If there is no response to
   fluoxetine combined with olanzapine, or quetiapine, consider lamotrigine on its own.
   People already taking lithium should have their plasma lithium levels checked and the
   dose optimised. If the lithium level is at its maximum and response inadequate,
   fluoxetine combined with olanzapine or quetiapine should be added. Alternatively,
   adding olanzapine or lamotrigine to lithium may be considered. If there is no response to
   adding fluoxetine combined with olanzapine, or adding quetiapine, stop the additional
   treatment and consider adding lamotrigine to lithium.

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People already taking valproate, should have their dose increased within the therapeutic
   range, as tolerated. If there is a limited response to optimal doses of valproate, fluoxetine
   combined with olanzapine or quetiapine should be added, depending on the person’s
   preference and previous response to treatment. If the person prefers, consider adding
   olanzapine (without fluoxetine) or lamotrigine to valproate. If there is no response to
   adding fluoxetine combined with olanzapine, or adding quetiapine, stop the additional
   treatment and consider adding lamotrigine to valproate. Follow recommendations above
   on valproate and pregnancy.
   Antidepressant medication should only be prescribed in bipolar depression as an adjunct
   to mood stabilisers, e.g. lithium or valproate or lamotrigine or olanzapine due to risk of
   switching and cycle acceleration. Such risks may be less with SSRIs.

Bipolar Disorder – Long-Term Treatment
   NICE recommends that long-term treatment should be discussed with the service
   user/carer, within 4 weeks of resolution of each episode of mania or bipolar depression
   Selection of long-term pharmacological treatment to prevent relapse should take into
   account drugs that have been effective during acute episodes of mania or bipolar
   depression
   Lithium should be offered as a first-line, long-term pharmacological treatment. If lithium is
   ineffective, NICE recommends considering adding valproate.
   If lithium is poorly tolerated or is not suitable, consider valproate or olanzapine instead,
   or quetiapine, if it has been effective during an episode of mania or bipolar depression.
   A structured psychological intervention (individual, group or family) designed for bipolar
   disorder is recommended as part of long term management.
   Long term monotherapy or combination treatments should be continued as long as
   clinically appropriate. If stopping long-term treatment, this should be done gradually and
   the patient monitored for relapse for 2 years after medication has stopped entirely.

Rapid-Cycling Bipolar Disorder

Rapid-cycling bipolar disorder is defined as the experience of at least four syndromal
depressive, manic, hypomanic or mixed episodes within a 12-month period
   NICE states that people with rapid cycling bipolar disorder should be offered the same
   interventions as people with other types of bipolar disorder.

Pharmacological Treatment of Rapid-Cycling Bipolar Disorder

   Treatment should be as for manic and depressive episode. In addition:
   o Review the service user’s previous treatments for bipolar disorder and optimise
      treatment doses and long-term treatment
   o Consider a further trial of any that were not given an adequate trial or not adhered to.
   o If the person is taking an antidepressant, ensure mood stabilizer is also prescribed.
      Consider withdrawing this due to increase risk of cycling.
   o A psychological intervention that has been developed specifically for bipolar disorder
      or a high-intensity psychological intervention should be offered.
   o Identify and manage possible precipitants for example drug and alcohol problems,
      thyroid dysfunction, other stressors etc.

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Bipolar Affective Disorder                                   Next Review: Jan 2021      6|
Relevant NICE guidance

   NICE CG185 (September 2014): Bipolar disorder: the assessment and management of
   bipolar disorder in adults, children and young people in primary and secondary care.
   http://www.nice.org.uk/guidance/cg185

   NICE TA292 (July 2013): Aripiprazole for treating moderate to severe manic episodes in
   adolescents with bipolar 1 disorder. http://www.nice.org.uk/guidance/ta292

   NICE pathways: Bipolar Disorder. http://pathways.nice.org.uk/pathways/bipolar-disorder

Local Shared Care Agreements

Shared Care Lithium guideline – Pan Mersey Area.
https://www.panmerseyapc.nhs.uk/media/2083/lithium_sharedcare.pdf

Mersey Care Clinical Guideline/Formulary Document        Updated:      Jan 2019
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Bipolar Affective Disorder – Acute Treatment for Mania/Hypomania

First Line:                 Relative Cost      Notes
Oral antipsychotics                            Consider for service users taking an antidepressant; those not taking an antipsychotic or mood stabiliser
Haloperidol                 £                  and those already taking lithium or valproate at optimal doses. Check plasma lithium levels to optimise
Risperidone                                    treatment. Antipsychotics can achieve rapid control of mania. Before prescribing, consider advance
   Tabs/Liquid              £                  statements, preference, side effects and individual risk factors e.g. diabetes, weight gain, adherence and
   Orodispersible           ££                 previous response. Monitor, as above.
   Branded                  ££-£££             If prescribed antidepressant, consider stopping due to risk of switching and more frequent cycling.
Olanzapine                                     *Aripiprazole is recommended by NICE TA292 as an option (for up to 12 weeks). for moderate to severe
   Tabs/orodispersible      £                  manic episodes in young people aged 13 and older with bipolar I disorder
   Branded/Velotab          £££/££££             *Consider risk of movement disorders (EPSE) and tolerability with haloperidol.
Quetiapine                                     Special liquids (eg quetiapine liquid) cost significantly more.
   Tabs                     £
   M/R                      ££-£££
   Branded                  £££
Aripiprazole
   Tabs                     £
   Orodispersible           ££
   Branded / Liquid         £££
Second Line:                Relative Cost      Notes
Try alternative             £-£££              Consider an alternative antipsychotic not tried from the above list if the first antipsychotic is poorly tolerated
antipsychotic                                  at any dose (including rapid weight gain) or if ineffective at the maximum licensed dose. Take into account
                                               previous response to treatment and side effects.
Add lithium                 £-£££              Consider lithium if alternative antipsychotic is not tolerated at optimal dose. Lithium has a slower onset of
                                               action. Consider if compliant with blood monitoring (see cautions and notes on lithium, above)
Add Valproate               £-£££              Consider if lithium is not suitable; Monitoring, see notes above. Teratogenic - Do not prescribe for girls or
  Depakote                  £££                women of child-bearing potential. Use adequate contraception. ** See MHRA warning ** Valproate
                                               medicines must not be used in women or girls of childbearing potential unless a Pregnancy Prevention
                                               Programme is in place. Women or girls or childbearing potential prescribed valproate should have a Risk
                                               Acknowledgement Form completed and signed at least annually.

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Bipolar Affective Disorder – Acute Treatment for Mania/Hypomania - Continued

Other                       Relative Cost      Notes
Benzodiazepines e.g.                           Use PRN for as short time as possible; Consider for severe anxiety and agitation present or if sleep
   Lorazepam                £                  deprived. Benzodiazepines can rapidly diminish overactivity but carry a risk of disinhibited behaviour,
   Clonazepam               £                  withdrawal symptoms, tolerance and dependence. They can also cause sedation, ataxia and falls.
Carbamazepine                                  Should not be used routinely for acute mania; Licensed for people who are intolerant of lithium or for whom
   Tabs                     £                  lithium is ineffective; Difficult to use- slow dose initiation; numerous side effects and interactions involving
   Liquid / Brand           £-££               enzyme induction; Teratogenic – avoid in girls or women of child-bearing potential

Asenapine                   ££££               Consultant initiation only by written request to the Chief Pharmacist.
                                               Risk of serious hypersensitivity reactions including anaphylactic/anaphylactoid reactions, angioedema,
                                               swollen tongue and swollen throat (pharyngeal oedema).
                                               Asenapine S/L tablet has anaesthetic properties, patients should be warned of oral numbness/tingling may
                                               occur within an hour after administration.
                                               Risk of photosensitisation may occur with higher dosages, patients should avoid direct sunlight.

ECT                         £££                NICE TA 59 recommends that ECT is used only for prolonged or severe manic episode to achieve rapid and
                                               short-term improvement of severe symptoms when an adequate trial of other treatment options has proven
                                               ineffective, and/or the individual has a potentially life-threatening condition

Not Recommended             Relative Cost      Notes
Lamotrigine, Topiramate,    £-£££              Do not offer lamotrigine to treat mania. There is inadequate supporting evidence of the effectiveness of
Gabapentin                                     topiramate and gabapentin as treatments for bipolar disorder.

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Bipolar Affective Disorder – Acute Depressive Episode

First Line:                  Relative Cost      Notes
Fluoxetine+Olanzapine        £-£££              All service users with moderate or severe bipolar depression who are not taking any medication to treat
OR                                              their bipolar disorder should be treated with fluoxetine combined with olanzapine or quetiapine on its own
Quetiapine                   £-£££              depending on personal preference and previous response.
OR                                              Alternatively, olanzapine without fluoxetine or lamotrigine on its own can be considered if preferred.
Olanzapine                   £-£££              If there is no response to fluoxetine combined with olanzapine, or quetiapine, consider lamotrigine on its
OR                                              own
Lamotrigine
   Tabs                      £
   Orodispersible            ££
   Brand                     £££
Second Line:                 Relative Cost      Notes
Lithium +                                           If service user is already on lithium as a prophylactic agent check levels and optimise dose. If dose is
olanzapine+fluoxetine          ££-£££               optimal and limited response, add fluoxetine combined with olanzapine or add quetiapine. Alternatively,
OR                                                  add olanzapine (without fluoxetine) or lamotrigine to lithium may be considered. If there is no response to
Lithium +Quetiapine            £-£££                adding fluoxetine combined with olanzapine, or adding quetiapine, stop the additional treatment and
OR                                                  consider adding lamotrigine to lithium.
Lithium + Olanzapine           £-£££
OR
Lithium +Lamotrigine           £-£££
Valproate +                                         If service user is already on valproate, increase dose within the therapeutic range, as tolerated. If there is
olanzapine+fluoxetine          ££-£££               a limited response to optimal doses of valproate, fluoxetine combined with olanzapine or quetiapine alone
OR                                                  should be added, depending on the person’s preference and previous response to treatment.
quetiapine                     £-£££                If the person prefers, consider adding olanzapine (without fluoxetine) or lamotrigine to valproate.
OR                                                  If there is no response to adding fluoxetine combined with olanzapine, or adding quetiapine, stop the
Olanzapine                     £-£££                additional treatment and consider adding lamotrigine to valproate.
OR
Lamotrigine                    £-£££                Be aware of potential interactions between Valproate and fluoxetine, lamotrigine and olanzapine.
** Take into account toxicity in overdose when prescribing psychotropic medication during periods of high suicide risk** Assess need to limit the quantity of
medication supplied to reduce the risk to life if the person overdoses **

Mersey Care Clinical Guideline/Formulary Document             Updated:     Jan 2019
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Bipolar Affective Disorder – Acute Depressive Episode, continued

Other                        Relative Cost      Notes
Antidepressants              £-£££              Antidepressant medication should only be prescribed in bipolar depression as an adjunct to mood
                                                stabilisers, e.g. lithium or valproate or lamotrigine or olanzapine due to risk of switching and cycle
                                                acceleration. Such risks may be less with SSRIs/SNRIs. Avoid tricyclics or MAOIs. Check side effects
                                                and interactions.
                                                **Consider stopping the antidepressant if in remission from depressive symptoms

Psychological                £££                Use of evidence-based psychological interventions developed specifically for bipolar disorder or high-
Interventions                                   intensity psychological interventions (e.g. cognitive behavioural therapy, interpersonal therapy or
                                                behavioural couples therapy) is recommended by NICE.
                                                Discuss with the person the possible benefits and risks of psychological interventions and their
                                                preference.
                                                People receiving psychological interventions should be monitored for clinical signs of mania or
                                                hypomania or deterioration of depressive symptoms.

Not Recommended              Relative Cost      Notes
Topiramate,                  £-££               Do not prescribe as there is inadequate supporting evidence of the effectiveness of topiramate and
Gabapentin                                      gabapentin as treatments for bipolar disorder,

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Bipolar Affective Disorder – Long Term Maintenance Therapy (Relapse Prevention)
First Line:                        Relative Cost          Notes
                                                          NICE recommends that long-term treatment should be discussed with the service user/carer, within
                                                          4 weeks of resolution of each episode of mania or bipolar depression
                                                          Long-term pharmacological treatment to prevent relapse should take into account drugs that have
                                                          been effective during acute episodes of mania or bipolar depression. The potential benefits of long
                                                          term treatment and risks, including side effects of medication used should be discussed with the
                                                          service user.
Lithium                            £                      Lithium should be offered as a first-line, long-term pharmacological treatment; It reduces the risk of
                                                          relapse, suicidal behavior, self harm and mortality. Monitor level (low therapeutic index), adverse
OR                                                        effects and be aware of the risk of rebound phenomena (see notes above).

Lithium +Valproate*                ££-£££                 If lithium is ineffective, NICE recommends considering adding valproate*.

Second Line:                       Relative Cost          Notes
Valproate* OR                      £-£££                  If lithium is poorly tolerated or is not suitable ( i.e. because the person does not agree to routine
Olanzapine                                                blood monitoring) , consider valproate* or olanzapine
Quetiapine                         £-£££                  Consider quetiapine if lithium is poorly tolerated or is not suitable and quetiapine was effective
                                                          during an acute episode of mania or bipolar depression.
Other:                             Relative Cost          Notes
Psychological therapy              £££                    A structured psychological intervention (individual, group or family) designed for bipolar disorder
                                                          which has a published evidence base manual outlining its delivery is recommended as part of long
                                                          term management to prevent relapse or for people who have some persistent symptoms between
                                                          episodes of mania and bipolar depression.

Other antipsychotics               £-£££                  Consider licensed indication, patients preference, previous response and side effect profile
                                                          Consider clozapine for treatment-refractory symptoms (off-label use)

Antidepressants                    £-£££                  Consider long-term treatment with SSRI and mood stabiliser for chronic recurrent depression

     * Follow recommendations above on valproate and pregnancy.

Mersey Care Clinical Guideline/Formulary Document                       Updated:     Jan 2019
Bipolar Affective Disorder                                              Next Review: Jan 2021                                                                     12
Appendix 1

Drugs Used in Bipolar Disorders

Drug;                    Dose                                      Contraindications and Cautions       Side Effects and Interactions
Licensed
Indications
Lithium (Priadel)         Dose range for treatment and            Contraindications                    Side effects
                           prophylaxis is 400-1200mg daily as a    - Hypersensitivity to lithium or      Lithium has a narrow therapeutic index.
Formulation                single dose or in 2 divided doses (if   excipients                            Side effects are related to serum levels, as follows:
Tablets m/r, lithium       elderly or < 50kg, (Reduce initial      - Cardiac disease                    - Mild gastrointestinal side effects such as nausea,
carbonate 200mg and        dose - 200mg-400mg daily).              - Cardiac insufficiency                abdominal discomfort and taste disorder
400mg                                                              - Severe renal impairment            - Tremor, especially fine hand tremors
                          Dose adjusted to achieve lithium        - Untreated hypothyroidism           - Peripheral oedema and weight gain
Liquid, sugar-free,        levels in the range of 0.4–1mmol/l.     - Breast-feeding                     - Hyperglycaemia,
lithium citrate            Sample taken at least 12 hours.         - Hyponatraemia, including due to    - Leucocytosis
520mg/5ml                  Monitoring schedule after the last      dehydration or low sodium diets      - Confusion
(5mL dose is               dose. Levels should not exceed          - Addison's disease                  - Reduction in thyroid and renal function
equivalent to 204mg        1.5mmol/l.                              - Brugada syndrome or family         - Polydipsia and/or polyuria
lithium carbonate)                                                 history of Brugada syndrome.         - Sexual dysfunction
                          Optimal serum lithium levels may                                              High serum-lithium levels (usually >1.5mmol/litre)
Licensed indications       vary for each service user.             Cautions                                can cause toxic effects including restlessness,
Prophylaxis of bipolar                                             - Renal and thyroid dysfunction,        apathy, nausea, coarse tremor, vomiting, diarrhoea,
affective disorder        Additional serum-lithium levels         - Electrolyte imbalance/diuretics       drowsiness, blurred vision, ataxia, dysarthria,
and                        should be made if significant           - Cardiac problems                      myalgia and arthralgia. Lithium should be stopped.
Treatment of acute         intercurrent disease or change in       - Psoriasis                             Higher levels can lead to confusion, hyperreflexia,
manic or hypomanic         sodium or fluid intake.                 - Seizures                              renal failure, convulsions, coma and death.
episodes.                                                          - Pregnancy                           Long-term adverse effects may include thyroid
                          Preparations vary widely in             - QT interval prolongation
                           bioavailability; changing the                                                   function disturbances such as euthyroid goitre
                                                                   - Elderly people                        and/or hypothyroidism and thyrotoxicosis.
                           preparation requires the same           - drug interactions
                           precautions as initiating treatment                                          Key interactions:
                                                                   - Low sodium diet
                                                                                                        NSAIDs; Diuretics e.g. thiazides, ACE Inhibitors;
                                                                   - Dehydration, diarrhoea, vomiting
                          Discontinue gradually                                                        Angiotensin II antagonists, calcium channel blockers,
                                                                                                        additive effect with psychotropic drugs

Mersey Care Clinical Guideline/Formulary Document                Updated:     Jan 2019
Bipolar Affective Disorder                                       Next Review: Jan 2021                                                            13
Drugs Used in Bipolar Disorders

Drug                      Dose                            Contraindications and Cautions            Side Effects and Interactions
Licensed
Indications
Valproate                 Initial dose: 750 mg daily in   Contraindications                         Side effects
Depakote: tablets         2–3 divided doses, increased    Active liver disease; family history of   Gastrointestinal disturbances, particularly at the start of
250mg; 500mg              according to response.          severe hepatic dysfunction; acute         therapy. Increased appetite, and weight gain is common.
Episenta capsules                                         porphyria; Pregnancy: valproate is        Less common adverse effects include oedema, headache,
150mg, 300mg              Maintenance dose: 1–2g          contraindicated In women of               reversible prolongation of bleeding time, and
(Other valproate          daily                           childbearing potential unless the         thrombocytopenia. Leucopenia and bone marrow
preparations are also     Doses greater than 45mg/kg      conditions of the pregnancy               depression have been reported. Tremor and ataxia have
used off label)           daily require careful           prevention programme are met.             also been reported usually when therapy is started.
                          monitoring                                                                Transient hair loss. Occasionally rashes. Rare but serious
Licensed indications      See above for monitoring        Cautions                                  side effect are liver damage and pancreatitis
Treatment of manic        schedule                        Valproate has a high teratogenic
episodes associated                                       potential and children exposed in         Interactions
with bipolar disorder                                     utero to valproate have a high risk for   Caution is recommended when giving valproate with other
when lithium is                                           congenital malformations and              drugs liable to interfere with blood coagulation, such as
contraindicated or not                                    neurodevelopmental disorders.             aspirin or warfarin. Use with other hepatotoxic drugs
tolerated. The                                            Monitor liver function before therapy     should be avoided. Use of highly protein bound drugs with
continuation of                                           and during first 6 months especially      valproate may increase free valproate plasma
treatment after manic                                     in those most at risk;                    concentrations.
episode could be                                          Measure full blood count and ensure       Care with dosing when used with lamotrigine
considered in patients                                    no undue potential for bleeding           Potential for additive effects when used with other
who have responded                                        before starting and before surgery        psychotropic drugs
to sodium valproate for                                   Systemic lupus erythematosus;
acute mania.                                              False-positive urine tests for ketones;
 Prophylaxis of bipolar                                   Avoid abrupt withdrawal;
disorder in patient who                                   Consider vitamin D supplementation
responded to valproate                                    in patients that are immobilised for
in acute phase.                                           long periods or who have inadequate
                                                          sun exposure or dietary intake of
                                                          calcium

Mersey Care Clinical Guideline/Formulary Document               Updated:      Jan 2019
Bipolar Affective Disorder                                      Next Review: Jan 2021                                                               14
Drugs Used in Bipolar Disorders

Drug;                    Dose                           Contraindications and Cautions         Side Effects and Interactions
Licensed
Indications
Carbamazepine            Initial dose: 400mg daily in   Contraindications:                     Side effects
                         divided doses                  AV conduction abnormalities            Common side effects include dizziness and ataxia;
Tablets 100mg, 200mg                                    (unless paced); history of bone-       gastrointestinal disturbances e.g. nausea and vomiting;
and 400mg;               Maintenance dose: 400–         marrow depression; acute               blurred vision; hypertension and hypotension; mild skin
                         600mg daily; max. 1.6g daily   porphyria; known hypersensitivity to   reactions and transient leucopenia
Prolonged Release                                       carbamazepine or structurally          - Serious dermatologic side effects include generalised
200mg and 400mg                                         related drugs (e.g. tricyclic          erythematous rashes Stevens-Johnson syndrome and toxic
Tablets;                                                antidepressants)                       epidermal necrolysis. Risk greater in in people of Thai or
                                                        Not recommended in combination         Han Chinese, Japanese or European descent.
Liquid 100 mg/5ml                                       with monoamine oxidase inhibitors      - Blood disorders reported include eosinophilia, leucopenia,
                                                        (MAOIs)                                thrombocytopenia, haemolytic anaemia, and anaemia.
                                                                                               - Also reported are hepatitis, jaundice, pancreatitis
Licensed indications                                    Cautions                               - Abnormalities of kidney function and cardiac conduction
Prophylaxis of bipolar                                  Cardiac disease.                       disorders. Congestive heart failure. Hyponatraemia have
disorder unresponsive                                   History of haematological reactions    occurred.
to lithium                                              to other drugs.                        - Exacerbation of seizures
                                                        Susceptibility to angle-closure        - Neurodevelopment disorders and congenital malformations
                                                        glaucoma                               have been reported in infants born to women given
                                                        Liver dysfunction or acute liver       carbamazepine during pregnancy
                                                        disease.
                                                        Manufacturer recommends blood          Interactions
                                                        counts and hepatic and renal           - Carbamazepine is a hepatic enzyme inducer, and induces
                                                        function tests                         its own metabolism as well as that of other drugs including
                                                        Plasma monitoring is required to       antibacterials (e.g. doxycycline), anticoagulants, and sex
                                                        exclude toxicity                       hormones (notably oral contraceptives) reducing therapeutic
                                                                                               effect.
                                                                                               - Drugs that induce CYP3A4 may increase the metabolism
                                                                                               of carbamazepine,
                                                                                               - May interact with MAOIs, other antiepileptics/ mood
                                                                                               stabilisers.

Mersey Care Clinical Guideline/Formulary Document             Updated:      Jan 2019
Bipolar Affective Disorder                                    Next Review: Jan 2021                                                             15
Drugs Used in Bipolar Disorders

Drug;                        Dose                                                        Contraindications and Cautions          Side Effects and Interactions
Licensed
Indications
Lamotrigine                  Monotherapy OR adjunctive therapy of bipolar                Contraindications                       Skin rash
(non-proprietary) or         disorder without valproate AND without                      Hypersensitivity to the active          Nausea, vomiting, diarrhoea, dry mouth
Lamictal                     enzyme inducing drugs*                                      substance or to any of the excipients   Aggression, irritability, agitation
                             initially 25mg once daily for 14 days, then                                                         Headache
Licensed Indication          50mg daily in 1–2 divided doses for further 14              Cautions                                Somnolence, dizziness, tremor, insomnia,
Adults aged 18 years         days, then 100mg daily in 1–2 divided doses                 Skin reactions - monitor and            Arthralgia, tiredness, pain, back pain
and above                    for further 7 days; usual maintenance 200mg                 withdrawal if rash, fever, or other     Nystagmus, diplopia, blurred vision,
- Prevention of              daily in 1–2 divided doses; max. 400mg daily                signs of hypersensitivity syndrome      hypersensitivity syndrome
depressive episodes in                                                                   develop                                 Blood disorders
patients with bipolar I      Adjunctive therapy of bipolar disorder with                 Increases clearance of hormonal
disorder who                 valproate, initially 25mg on alternate days for             contraceptive
experience                   14 days, then 25mg once daily for further 14                Parkinson’s disease - risk of
predominantly                days, then 50mg daily in 1–2 divided doses for              exacerbation
depressive episodes          further 7 days; usual maintenance 100mg daily               Blood disorders
                             in 1–2 divided doses; max. 200mg daily                      Renal/hepatic impairment
                                                                                         Suicidal risk
                             Adjunctive therapy of bipolar disorder without
                             valproate WITH enzyme inducing drugs*
                             initially 50mg once daily for 14 days, then
                             50mg twice daily for further 14 days, then
                             100mg twice daily for further 7 days, then
                             150mg twice daily for further 7 days; usual
                             maintenance 200mg twice daily

                             dose adjustments may be required if other
                             drugs are added to or withdrawn from their
                             treatment regimen
* phenytoin, carbamazepine, phenobarbitone, primidone, rifampicin, lopinavir/ritonavir

Mersey Care Clinical Guideline/Formulary Document                          Updated:      Jan 2019
Bipolar Affective Disorder                                                 Next Review: Jan 2021                                                                 16
Drugs Used in Bipolar Disorders
Drug; Licensed Indication               Dose                            Contraindications and                 Side Effects and Interactions*
                                                                        Cautions*
Antipsychotics                                                          Contraindications:                    Side effects
Quetiapine - oral                       Usual range 400–                - Comatose states,                    - Gastrointestinal adverse effects—including constipation, dry
Manic episodes; major                   800 mg daily in 2               - CNS depression                      mouth, nausea
depressive episodes in bipolar          divided doses.                  - Phaeochromocytoma                   - Central nervous system adverse effects including sedation
disorders; prevention of bipolar        Treatment of bipolar                                                  and sleep disturbances
disorder when response in               depression max 600mg            Cautions:                             - Extrapyramidal side effects—acute dystonia, akathisia,
acute phase                             daily.                          - Cardiovascular disease              parkinsonism, tardive dyskinesia
                                                                        - Elderly patients with dementia      - Neuroleptic malignant syndrome
Olanzapine – oral                       15 mg daily adjusted to         - Parkinson's disease                 - Convulsions
Moderate to severe manic                usual range of 5–20mg.          - Epilepsy                            - Cardiovascular adverse effects
episode; prevention of manic            Max. 20mg                       - Depression                          - Blood pressure changes
episode when response in                                                - Myasthenia gravis                   - Cerebrovascular events
acute phase                                                             - Prostatic hypertrophy               - Cardiac rhythm disorders particularly QT prolongation
                                                                        - Angle-closure glaucoma              - Venous thromboembolism
Aripiprazole – oral                     15mg once daily,                - Severe respiratory disease          - Metabolic adverse effects—including weight gain,
Moderate to severe manic                increased if necessary;         - History of jaundice                 dyslipidaemia, hyperglycaemia
episodes; prevention of manic           max. 30mg once daily            - History of blood dyscrasias         - Hyperprolactinaemia and sexual adverse effects—including
episode                                                                 - Photosensitisation may occur        menstrual and sexual dysfunction, osteoporosis
                                        2mg once daily,                 with higher dosages.                  - Blood disorders—including neutropenia, agranulocytosis
Risperidone – oral                      increased if necessary          - Dependence and withdrawal           - Temperature regulation—hypothermia and hyperthermia
Moderate to severe manic                by1mg daily; max 6mg            reactions                             - Adverse effects on the skin—including rash, pruritus
episodes                                daily                                                                 - Adverse effects on the eye—including precipitation of
                                                                                                              glaucoma, mydriasis, and pigmentation
                                        2–20 mg daily as single                                               - Antimuscarinic adverse effects—including constipation,
Haloperidol – oral                      or divided doses,                                                     nasal stuffiness, and urinary retention
Mania and hypomania                     maintenance 1–3 mg
                                        three times daily max.                                                Drug interactions of concern include interactions which
                                        20 mg daily (in divided                                               increase adverse effects (hypotension, sedation, cardiac
                                        doses);                                                               rhythm disturbances)

Asenapine- S/L                          Starting dose 5 mg
moderate to severe manic                twice daily. May be
episodes                                increased to 10 mg
                                        twice daily.
*See Psychosis and Schizophrenia clinical guideline document for comparative side effects of antipsychotics

Mersey Care Clinical Guideline/Formulary Document                               Updated:      Jan 2019
Bipolar Affective Disorder                                                      Next Review: Jan 2021                                                                    17
Appendix 2: Schedule for Physical Monitoring for People with Bipolar Disorder
Adapted from NICE CG38 – Bipolar Disorder and Updated in line with NICE CG185

                   Monitoring for all patients                                                  Monitoring for specific drugs
Test or           Initial       6 months            Annual         Antipsychotics         Lithium                 Valproate*          Carbamazepine            Lamotrigine
measurement       health                            check up
                  check
Thyroid           Yes           Yes                 Yes; 6                                At start and every 6
function                                            monthly if                            months; more often
                                                    rapid                                 if evidence of
                                                    cycling                               deterioration
Liver function    Yes                               Yes            If clinically                                  At start and at 6   At start and at 6        At start
                                                                   relevant                                       months and          months
                                                                                                                  repeat annually
Renal function/   Yes           Yes                 Yes            If clinically          At start and every 6                        Urea and                 At start
eGFR                                                               relevant               months; more often                          electrolytes every
U&Es                                                                                      if there is evidence                        6 months
including                                                                                 of deterioration of
Calcium                                                                                   the patient or if
                                                                                          they start taking
                                                                                          drugs such as ACE
                                                                                          inhibitors, diuretics
                                                                                          or NSAIDs
Full blood        Yes                                              If clinically          A start of treatment    At start and at 6   At start and at 6        At start
count                                                              relevant.                                      months and          months
                                                                   Mandatory for                                  repeat annually
                                                                   clozapine
Blood (plasma)    Yes                               Yes            At start and at 12
glucose                                                            weeks; more
fasting or                                                         often if evidence
HbA1c                                                              of elevated levels
Lipid profile     Yes                               Yes            At start and at 12
                                                                   weeks; more
                                                                   often if elevated
                                                                   levels

Mersey Care Clinical Guideline/Formulary Document                Updated:      Jan 2019
Bipolar Affective Disorder                                       Next Review: Jan 2021                                                                    18
Monitoring for all patients                                                     Monitoring for specific drugs
Test or           Initial       6 months            Annual           Antipsychotics         Lithium                  Valproate*          Carbamazepine            Lamotrigine
measurement       health                            check up
                  check
Blood             Yes                               Yes              At start and at
pressure/                                                            each dose
Pulse                                                                change
Prolactin         Yes                                                If symptoms of
                                                                     raised prolactin
                                                                     develop
ECG                             If indicated by     If indicated     At start if            At start, especially
                                history or           by history       specified by          if risk factors for or
                                clinical picture     or clinical      license; if there     existing
                                                     picture          are risk factors      cardiovascular
                                                                      for, history of or    disease
                                                                      existing cardio-
                                                                      vascular disease
                                                                      or if an inpatient
Weight/height     Yes           Yes                 Yes              weekly for the first   At start then every      At start and at 6   At start and at 6
BMI                                                                  6 weeks, then at       6 months or more if      months and          months if the
                                                                     12 weeks; more         the patient gains        repeat annually;    patient gains
                                                                     often if patient       weight rapidly           more often if       weight rapidly
                                                                     gains weight                                    patient gains
                                                                     rapidly                                         weight rapidly
Diet              Nutritional                                        Dietary advice         Dietary and fluid
                  Status                                                                    intake advice
Physical                        Yes                 Yes              At start then
Activity                                                             annually

Mersey Care Clinical Guideline/Formulary Document                  Updated:      Jan 2019
Bipolar Affective Disorder                                         Next Review: Jan 2021                                                                     19
Monitoring for                                                  Monitoring for specific drugs
                        all patients
Test or               Initial health     Annual     Antipsychotics         Lithium                   Valproate*         Carbamazepine    Lamotrigine
measurement           check              check up

Drug screening        If suggested by
and chest X-ray       the history or
                      clinical picture
EEG, MRI, CT          If organic
scans                 aetiology or
                      comorbidity is
                      suspected
Smoking/              Yes                Yes
alcohol

Serum levels of                                                            1 week after initiation   Only if there is   If clinically
drug                                                                       and every 5-7 days        evidence of        relevant
                                                                           after every dose          ineffectiveness
                                                                           change until levels       or poor
                                                                           stable, then every 3      adherence or
                                                                           months for the first      toxicity
                                                                           year then 3-6 months
                                                                           depending on risk
                                                                           factors

Mersey Care Clinical Guideline/Formulary Document        Updated:      Jan 2019
Bipolar Affective Disorder                               Next Review: Jan 2021                                                          20
References
1. NICE CG185 (September 2014): Bipolar disorder: the assessment and management of bipolar disorder in adults, children and young people
   in primary and secondary care. http://www.nice.org.uk/guidance/cg185

2. NICE TA292 (July 2013): Aripiprazole for treating moderate to severe manic episodes in adolescents with bipolar 1 disorder.
   http://www.nice.org.uk/guidance/ta292

3. NICE QS95 (2015): Bipolar disorder in adults. http://www.nice.org.uk/guidance/qs95

4. British Association for Psychopharmacology. G. M Goodwin, Consensus Group of the British Association for Psychopharmacology.
   Evidence-based guidelines for treating bipolar disorder: Revised third edition recommendations from the British Association for
   Psychopharmacology. Journal of Psychopharmacology (2016) 1-59. Available at: https://www.bap.org.uk/pdfs/BAP_Guidelines-Bipolar.pdf

5. Royal College of Psychiatrists Position Statement 04/18. Withdrawal of, and alternatives to, valproate-containing medicines in girls and
   women of childbearing potential who have a psychiatric illness. December 2018. https://www.bap.org.uk/pdfs/PS04-18-December2018.pdf

6. MHRA (2018). Valproate use by women and girls. Information about the risks of taking valproate medicines during pregnancy.
   https://www.gov.uk/guidance/valproate-use-by-women-and-girls. Updated August 2018

7. MHRA (2018) Valproate medicines: contraindicated in women and girls of childbearing potential unless conditions of Pregnancy Prevention
   Programme are met https://www.gov.uk/drug-safety-update/valproate-medicines-epilim-depakote-contraindicated-in-women-and-girls-of-
   childbearing-potential-unless-conditions-of-pregnancy-prevention-programme-are-met#conditions-and-guidance-for-the-pregnancy-
   prevention-programme. Update May 2018

8. MHRA (2018) Valproate banned without the pregnancy prevention programme https://www.gov.uk/government/news/valproate-banned-
   without-the-pregnancy-prevention-programme

9. NICE Clinical Knowledge Summaries. Bipolar disorder. Last revised in September 2017. http://cks.nice.org.uk/bipolar-disorder

10. BNF online at: https://www.medicinescomplete.com/mc/bnf/current/

11. Martindale – The complete drug reference online at: http://www.medicinescomplete.com/mc/ [subscription required]

12. SPC for drugs referred to in this guideline can be found in the Electronic Medicines Compendium (http://emc.medicines.org.uk/).

13. Shared Care Lithium guideline – Pan Mersey Area. https://www.panmerseyapc.nhs.uk/media/2083/lithium_sharedcare.pdf

Mersey Care Clinical Guideline/Formulary Document         Updated:      Jan 2019
Bipolar Affective Disorder                                Next Review: Jan 2021                                                       21
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