Bipolar I disorder in an unplanned pregnancy: whose risk do you weigh?
A 27-year-old woman with bipolar I disorder attends the outpatient clinic with an ultrasound-confirmed 8-week pregnancy. She has had three manic episodes, two with psychotic features, and one severe depressive episode with a serious overdose at age 22, at which time she was taking no prophylaxis. For the last 14 months she has been well on sodium valproate 1000 mg daily and quetiapine 100 mg at night; lithium was stopped two years ago after troublesome tremor. Her BMI is 32, she smokes 10 cigarettes daily, and she has no other medical illness. She is not taking folic acid. The pregnancy was unplanned, and she is frightened by what she has read online; she stopped the valproate herself four days ago and now wants to stop everything 'to protect the baby'. Her husband supports this. Her mother also has bipolar disorder and had a postpartum psychosis.
1. She asks you to support stopping all psychotropic medication. How would you weigh the risks of continuation against those of withdrawal, and what do you recommend?
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Reframe the choice. She is not choosing between 'drugs' and 'no drugs'; she is choosing between a planned, monitored regimen and untreated bipolar disorder through pregnancy and the puerperium.
Risk of stopping. Three manic episodes, two with psychosis, and a serious overdose while unmedicated place her in the highest relapse tier. Roughly half of women with bipolar disorder relapse during pregnancy, with peaks in the first trimester after abrupt discontinuation and in the first month postpartum. Psychotic mania at 30 weeks or a postpartum psychosis is dangerous for both mother and fetus: poor nutrition, impulsive behaviour, obstetric neglect, and suicide risk.
Risk of continuing valproate. Valproate is the drug that must change: first-trimester exposure carries a 1–2% neural tube defect risk (higher at doses ≥1000 mg/day), around a 10% risk of major malformation overall, and dose-dependent neurodevelopmental harm. Stopping it is right; stopping it unsupervised over four days is not.
Recommendation. Cross-taper valproate to quetiapine, the antipsychotic with the largest pregnancy dataset, building to 300–400 mg at night, plus folic acid 5 mg, smoking cessation support, a level-2 anomaly scan at 18–20 weeks, and a written relapse plan. If quetiapine alone proves insufficient, lithium is not absolutely forbidden - the absolute Ebstein risk is about 1/1000 - but needs levels every 2–4 weeks, fetal echocardiography at 18–20 weeks, and no abrupt changes. Document that the numbers were discussed: her autonomy governs the decision, but she is entitled to accurate figures rather than internet headlines.
2. Set out your monitoring plan for the remainder of the pregnancy and the first three months postpartum.
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Pregnancy.
- Mental state: review every 2–4 weeks, more often after any dose change; use a validated mood scale and a sleep diary, and involve the husband with her consent.
- Physical: weight and BMI, blood pressure and glucose (baseline BMI 32 plus quetiapine), and thyroid function if lithium is added.
- Quetiapine: sedation, orthostasis, constipation; no routine plasma levels, but consider them if adherence is doubtful.
- Lithium, if used: trough level every 2–4 weeks, then weekly from 36 weeks; remember levels rise with falling glomerular filtration and volume depletion, so check during vomiting or hyperemesis.
- Fetal: dating scan, anomaly scan at 18–20 weeks with cardiac views, growth scans in the third trimester.
Delivery. Inform the obstetric and anaesthetic teams in advance; avoid dehydration and prolonged labour, both of which raise lithium levels; plan the postnatal period as a high-risk window and arrange a psychiatric review within 48 hours of delivery.
Postpartum. The risk of recurrence is highest in the first 4 weeks. Restart or optimise prophylaxis immediately after delivery rather than waiting for symptoms, protect sleep (shared night feeds, one uninterrupted 5–6-hour block), and review weekly for 6 weeks. Discuss breastfeeding drug by drug: quetiapine is generally compatible with monitoring for sedation and weight gain; lithium is possible but requires infant levels and a committed plan. Screen for postpartum depression and ask directly about thoughts of harming herself or the baby at every contact.
3. At 24 weeks she is brought in by her husband: she has not slept for four nights, is praying loudly, declares that she will 'give birth to a prophet', has stopped eating, and has struck her mother. What is your assessment and management?
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Assessment. This is an acute manic episode with psychotic features - grandiosity, decreased need for sleep, pressured speech, agitation, and violence - in a pregnant woman with a known bipolar I disorder. Exclude delirium and organic precipitants (infection, dehydration, thyrotoxicosis, substance use, electrolyte disturbance) with basic bloods, urinalysis and a collateral history. Assess suicide risk, risk to others, and fetal wellbeing, and establish that she lacks capacity to accept treatment at this moment.
Setting. She needs admission, and given the risk to herself, her fetus and her mother, this will usually be involuntary under the applicable mental health legislation; involve the obstetric team from the outset and use the least restrictive setting that can provide 1:1 observation and fetal monitoring.
Treatment. Restart an antipsychotic promptly at an adequate dose - quetiapine titrated upwards, or haloperidol if rapid control is needed, with ECG monitoring and attention to QT. Avoid valproate and carbamazepine absolutely. Use short courses of a benzodiazepine (lorazepam) for agitation and sleep. Electroconvulsive therapy is a legitimate and effective option for severe mania in pregnancy, particularly if she deteriorates, refuses oral treatment, or develops features of exhaustion; it requires anaesthetic and obstetric assessment but is not contraindicated by pregnancy.
Concurrent care. Rehydration and nutrition, thiamine if intake is poor, thromboprophylaxis, fetal heart monitoring if she is agitated or sedated, and daily obstetric review. Plan delivery-ward liaison now, since she is likely to remain unwell into the third trimester.