Planning a Pregnancy on Lithium — Free SCA Practice Case
Woman on lithium who wants to try for a baby
Station Timer
Golden Minute
Initial Introduction
•Introduce yourself
•Ask an open question — "How can I help you today?"
•Listen — don't interrupt
•Catch early cues
Data Gathering
History, ICE & Diagnosis
Clinical Management
Diagnosis, Plan & Decisions
Safety Net
Follow-up & Close
Five cases are free: a live 12-minute consultation with an AI patient each, marked, and no card.
Materials for Candidate
Please review before starting the consultation
Full Name
Cerys Llewellyn
Age
30 years
Consultation Type
VideoAge
30
Situation
Video Consultation.
Reason for Encounter
"I want to talk about my lithium. My husband and I are ready to start a family."
Medical Records
- ●PMH: Bipolar I disorder, diagnosed at 26 after a manic episode with psychosis and a six week admission. Discharged to GP shared care two years ago. No relapse.
- ●Medications: Lithium carbonate MR 400 mg, two at night. Olanzapine stopped after five months. NKDA.
- ●Social: Married, non smoker, alcohol about 4 units weekly. Contraception: condoms.
Recent Notes
- ●Lithium monitoring, eleven months ago: Level 0.71 mmol/L, eGFR 91, TSH 1.9, calcium 2.33. Mood stable.
Patient Script
For the friend playing the patient role
Character Overview: You are Cerys Llewellyn, a 30 year old collections manager at a regional museum, on a video call at home after work. You are articulate, organised and likeable, and you like to have a plan. Underneath you are anxious, because this decision feels enormous.
You have bipolar disorder. At 26 a manic episode ended with six weeks in hospital. You have taken lithium since, two tablets every night, never missing a dose, and have had no episode in four years. You and your husband Huw, a water company network technician, decided last month to start a family.
At the weekend you read the leaflet in your lithium box properly for the first time: do not take it if you are pregnant, especially in the first three months, and talk to your doctor well before you become pregnant. The same week a colleague sent you a newspaper article about medicines and babies born with problems. You have decided to come off lithium: one tablet from tonight, none at all from the day after tomorrow, so it is out of your body before you stop condoms after your next period. You have changed nothing yet and told only Huw, who will back whatever you decide.
You do not volunteer how frightening the episode was, that you half believe you no longer need lithium, or that you would rather risk being ill yourself than harm a baby, until asked. Your voice is quick and bright about the plan and slower and quieter about being ill.
Opening Sentence: "Hi, thanks for fitting me in. I wanted to talk about my lithium. Huw and I are going to start trying for a baby, so I'm coming off the lithium this week, and I just want to check I'm doing it properly."
History if Asked (Data Gathering Phase)
- ●The plan and the timing: "One tablet from tonight, and then none at all from the day after tomorrow. I want it completely out of my system before we start trying. I've worked it all out." "I took my two tablets last night. I haven't missed any, ever." Why now: "I'm thirty, and I don't want to keep putting it off."
- ●Contraception and periods: "Condoms, every time. We'll stop after my next period. My last one started eight days ago and they're regular, every twenty eight or twenty nine days. There's no way I'm pregnant."
- ●The original episode: "I was twenty six. I stopped sleeping, about five nights with hardly any, and I felt amazing. I was convinced I'd catalogue and rehouse the entire museum collection in a week. I ran up about four thousand pounds on a credit card and I can't even tell you what on. I thought the radio was giving me messages. Huw, my boyfriend then, got me to A and E, and I was in hospital for six weeks." A low spell the year before: a few months of not getting out of bed.
- ●Treatment since: "They put me on olanzapine and lithium. I stayed on the olanzapine about five months, then put on over a stone and felt like a zombie, so the psychiatrist let me stop it. Four years since, not one episode. The mental health team signed me off two years ago and it's all been with the surgery."
- ●Mood and risk now: "I'm fine. I'm sleeping about seven hours, I'm not low, my thoughts aren't racing and I'm not spending anything silly. I'm just anxious about all this. No thoughts of harming myself, ever."
- ●Her warning signs: "Huw says I go chatty and fast, I sleep less without feeling tired, and I start about ten projects at once. I can't see it when it's happening, because it feels brilliant."
Ideas, Concerns, Expectations
Gating note: Cerys does not raise any of the following herself. Each part comes out only when the doctor asks what she has read, what is worrying her, or what she was hoping for from this call.
- ●Ideas: She believes lithium must be completely out of her body before she conceives, and that any left will damage the baby. "The leaflet says not to take it if you're pregnant, especially in the first three months, so I took that as a no. A colleague sent me an article about tablets and babies born with problems, and there was something about lithium and the baby's heart." After four years well she half wonders whether she still needs it: "I've wondered if I even need it any more."
- ●Concerns: Fear of harming the baby. "I'd never forgive myself if the baby was born with something wrong and it was down to my tablets." Asked about being ill again, her voice drops: "I keep telling myself I'd manage. But I wouldn't want Huw to go through that again. I know it frightened him badly. And a baby can't cope with a mum who's like that."
- ●Expectations: She hopes to be told the right way to come off lithium quickly. "I'd love to do this without any tablets at all, like any other woman trying for a baby."
If Asked: Medical History and Medications
Gating note: Cerys answers each of these plainly when the doctor asks about it, and she knows her tablets by size and what they are for.
- ●Lithium and blood tests: "Two of the four hundred milligram slow release ones at about ten at night. I'm a bit thirsty, and my hands shake slightly when I'm tired. My last blood test was about eleven months ago, with the nurse, and I think another is due."
- ●Painkillers: "Ibuprofen for my periods, two of the 200 milligram ones three times a day for the first couple of days, most months. I've never thought about it with the lithium. Occasionally paracetamol."
- ●Other health: No other tablets or vitamins, no diabetes, epilepsy or thyroid problems, kidneys fine on the last test, no allergies. Nobody in her family has had anything like it. A glass or two of wine at the weekend, never smoked, no drugs, normal diet.
Social History and Lifestyle Impact
- ●Work and home: She manages a collections team of six at the museum, and her line manager knows about her health and is supportive. She lives with Huw in a terraced house, and her mum lives twenty minutes away. "Huw's brilliant. He knows what to look out for with me. My mum would help, but she gets a bit panicky."
If Asked: Associated Symptoms
Gating note: Answers are brief and natural. The following are all negative: low mood, racing thoughts, needing less sleep, hearing or seeing things, spending or risky behaviour, unsteadiness, confusion, vomiting, diarrhoea. She has a little extra thirst and a tiny shake when tired. If asked to show her tremor on camera: "I'd rather not do that over the screen. I can come in so you can look properly."
Responses to Management (The Negotiation Phase)
- ●If the doctor tells her not to reduce or stop lithium this week, or explains that stopping quickly is risky and relapse is common:
- ●Reaction: Taken aback. "But I've got it all planned. Are you telling me I can't ever come off it?" Told it is the speed: "I thought quick and clean was better." If offered a slow reduction supervised at the practice: "Could we start this week, just more slowly?" She accepts waiting once told lithium should not be changed without specialist advice.
- ●If the doctor explains the risk to the baby:
- ●Reaction: Given a balanced figure (about 1 in 100 babies have a heart defect anyway, perhaps 2 in 100 with lithium): "So ninety eight out of a hundred are fine? That's better than I'd feared. But it's still me choosing to add any risk at all, isn't it?" If told it is completely safe: "That doesn't sound right. The leaflet says not to take it." If told harm is high or certain: tearful, "Then I can't stay on it," settling when given a balanced picture. If told stopping after she is pregnant may not remove the early risk: "I thought it was all about getting it out of my body first."
- ●If the doctor suggests carrying on with both tablets and condoms until a specialist has seen her, or mentions a perinatal team:
- ●Reaction: Impatient. "How long will that take? I'm thirty, I don't want to wait months." Given a realistic timescale and a way to chase it: "A few weeks I can do, as long as there's a real next step and a date I can chase." About the team: "Will it go on my record? Will they think I can't cope, or take the baby away?" Reassured it is about planning to stay well: "Okay. If it's about helping me plan, then yes."
- ●If the doctor discusses other tablets or options:
- ●Reaction: About a switch: "Which one? I won't go back on the olanzapine. I felt like a zombie." About valproate or carbamazepine: "Isn't valproate the one that's been in the news for harming babies?" About staying on lithium: "But that's exactly what the leaflet says not to do."
- ●If the doctor raises the weeks after the birth, breastfeeding, ibuprofen, blood tests or Huw:
- ●Reaction: After the birth: "We thought the hard part was the pregnancy." Breastfeeding: "I'd always planned to. Does this mean I can't?" She accepts a specialist will talk it through. Ibuprofen: "What do I take instead?" She is happy with paracetamol. Blood tests and folic acid: "Fine. I can come in first thing tomorrow, before work." About Huw: "Yes, he'd want to be there. He's much better than me at noticing when I'm getting high."
- ●If the doctor gives safety netting, agrees a plan, or dismisses her fears:
- ●Reaction: To "come back if you feel unwell": "But when I'm high I feel brilliant. How would I know?" Given specific signs: "Could Huw have a copy as well?" Asked about vomiting or diarrhoea: "I'd have just carried on. So I should call the surgery the same day?" If lectured: "I feel like you're not listening. I'm only trying to do the right thing." Once a plan is agreed: "So I carry on with both tablets, keep using condoms, have my bloods done, and wait for the specialist. When could we realistically start trying?"
Mark Scheme
Domain 1: Data Gathering and Diagnosis
Domain 2: Clinical Management and Medical Complexity
Domain 3: Relating to Others
Clinical Learning Points
The Core Dilemma and the Model Plan
- ●Cerys has bipolar I disorder. Her first episode at 26 was manic with psychosis and needed a six week admission, and she has been well for four years on lithium. She plans to halve her dose tonight and stop within days so that none is left when she and Huw start trying for a baby.
- ●The motive is good but the method is the riskiest option. Stopping lithium quickly is the biggest modifiable cause of relapse, and relapse in pregnancy or after birth is dangerous for her and the baby.
- ●The task is not to decide whether lithium is allowed. It is to stop an unsafe plan, keep her protected while a specialist works out the safest route, and help her make an informed decision.
- ●Model plan: do not reduce or stop lithium now, keep contraception going, refer now to a perinatal mental health service (or the community mental health team), give a calibrated account of both risks, arrange the overdue bloods, advise on ibuprofen, sickness and folic acid, plan the postnatal period, give specific safety netting and follow up within a week. Continuing lithium, switching gradually to an antipsychotic or a planned slow reduction all pass when chosen with a specialist.
Why Stopping Quickly Is Dangerous
- ●The BNF lists abrupt withdrawal as a caution. NICE CG185 (bipolar disorder, updated September 2025) says a stop should be gradual over at least 4 weeks and preferably up to 3 months, with close monitoring for early mania and depression during the reduction and for 3 months after. CG185 also says to refer again to secondary care if a woman is planning a pregnancy or considering stopping medication.
- ●NICE CKS says not to alter or stop treatment without specialist advice. CKS pre conception advice says a woman with past severe mental illness should continue effective contraception until the psychiatrist has assessed her.
- ●In a cohort of 89 pregnant women well at conception (Viguera, 2007), recurrence was about twofold more likely after stopping mood stabilisers, and the median time to recurrence was 11 times shorter after rapid compared with gradual discontinuation. Nearly half of recurrences came in the first trimester.
- ●"How quickly can I stop?" therefore has the wrong premise. The safe speed is slow and is chosen with a specialist.
The Risk to the Baby
- ●The BNF advises avoiding lithium in pregnancy if possible, especially in the first trimester because of cardiac malformations, with close monitoring of levels because of neonatal toxicity.
- ●The UK Teratology Information Service (UKTIS, July 2022) says about 1 in 100 babies born in the UK has a heart defect and some studies suggest about 2 in 100 exposed to lithium, so the great majority have a normal heart. It says continuing lithium is likely to be the safest option for a woman at high risk of relapse, and no extra fetal monitoring is needed beyond the routine 20 week scan.
- ●A large US cohort (Patorno, NEJM 2017) found cardiac malformations in 2.41% of exposed against 1.15% of unexposed babies (adjusted risk ratio 1.65), dose related: 1.11 at 600 mg a day or less and 3.22 above 900 mg. Her 800 mg is in the middle band. The effect, including Ebstein's anomaly, was smaller than once feared.
- ●NICE CG192 asks clinicians to explain that there is a risk of fetal heart malformation in the first trimester but that its size is uncertain. The aim is calibrated language: a small absolute increase, not "safe" and not "certain harm".
- ●Stopping or switching after pregnancy is confirmed may not remove the early risk (CG192 1.4.15 and 1.4.35), because the heart forms in the first weeks, often before a test is positive. A planned gradual change completed before conception avoids first trimester exposure at the price of relapse risk, which is the trade a specialist weighs with her.
Guidance on Lithium and the Options
- ●CG192 1.4.33 (2014, never amended) says not to offer lithium to women planning pregnancy unless an antipsychotic has not been effective. It is framed around which drug to offer. CKS (January 2026) lists staying on the current drug through conception, pregnancy and birth as one of three options, and UKTIS supports continuing, so continuing, switching or a planned gradual reduction each pass when decided with a specialist.
- ●For a woman who becomes pregnant on lithium, CG192 says to consider stopping gradually over 4 weeks if she is well, or switching gradually to an antipsychotic, or continuing if she is at high relapse risk and an antipsychotic is unlikely to work (1.4.35 and 1.4.36). If she stays on it, levels are checked every 4 weeks and weekly from 36 weeks, with birth in hospital (1.4.37).
- ●Her olanzapine was stopped for weight gain and sedation, not as a documented failure, so whether an antipsychotic would work is untested. A severe first episode with psychosis favours keeping a mood stabiliser. None of this is for the GP to settle alone.
- ●Valproate and carbamazepine are not alternatives. NICE says not to offer valproate to women planning pregnancy, and the MHRA allows it in women able to have children only under its pregnancy prevention programme. Lamotrigine is a specialist decision.
Referral, Safety and Monitoring
- ●CG192 1.4.2 and CKS advise preconception counselling at a secondary mental health service, preferably perinatal. Send a short summary (the original episode, admission, dose, last level, olanzapine history, current stability). The practice keeps prescribing unchanged and checks the referral arrives. NICE recognises that women may fear stigma or that the baby will be taken into care (1.5.1), so say honestly that these teams exist to help women plan to stay well.
- ●Lithium levels, kidney and thyroid function, calcium and weight are due every 6 months after the first year (CG185). The level is taken 12 hours after the last dose.
- ●Warn against over the counter ibuprofen and other NSAIDs, which raise lithium levels. NICE CKS supports paracetamol for period pain. Advise same day help with vomiting, diarrhoea or dehydration, which raise levels and risk toxicity.
- ●Folic acid 400 micrograms daily from before conception until 12 weeks. Lithium is not a reason for 5 mg, but a candidate who advises 5 mg is not marked down. Avoid alcohol when trying to conceive.
Pregnancy, Birth and Breastfeeding
- ●The postnatal period carries the highest relapse risk. NICE asks professionals to be alert for postpartum psychosis in the first 2 weeks (1.5.11) and to arrange assessment within 4 hours of referral if symptoms start suddenly (1.5.12). A meta analysis (Wesseloo, 2016) found relapse in 66% of women with bipolar disorder who were medication free in pregnancy against 23% of those taking preventive medication.
- ●Lithium requirements rise in the second and third trimesters and fall abruptly after delivery, so levels need close review in the first days. The team should plan sleep protection, since broken sleep is itself a trigger.
- ●Breastfeeding: the BNF, CKS and the manufacturer say avoid lithium, NICE CG192 (1.9.8) encourages breastfeeding unless taking lithium, and the NHS page allows it after specialist advice. Both a specialist plan that allows it and advice to avoid it are supported. The decision belongs to a perinatal specialist (UKDILAS gives advice).
Safety Netting and Follow Up
- ●Name the early warning signs: sleeping much less without feeling tired, racing thoughts, fast talk, many projects, spending, feeling unusually high, or low mood with hopelessness. She feels brilliant when high, so someone close should spot it. With her permission share a written list with Huw.
- ●Same day contact with the practice or the local mental health crisis service for early signs; 999 for thoughts of self harm or losing touch with reality.
- ●Same day help for vomiting, diarrhoea, worsening tremor, unsteadiness or confusion.
- ●If a period is late: test and ring the practice that day, and do not stop lithium suddenly.
- ●Follow up within about a week to confirm the referral, the bloods and her mood, and agree who contacts whom if there is delay.
Common Mistakes in This Station
- ●Agreeing to a fast taper because she is determined, or supervising a slow taper without specialist advice.
- ●Saying lithium is "completely safe" or that it will definitely harm the baby, or discussing only the baby or only relapse.
- ●Suggesting she stops lithium at a positive test, or advising her to stop contraception now.
- ●Suggesting valproate or carbamazepine as the safer option.
- ●Not asking about the original episode, so the referral is not anchored to her history.
- ●Missing the monthly ibuprofen or the overdue lithium monitoring.
- ●Forgetting the postnatal period.
- ●Offering reassurance that cannot be given in answer to her fear of being ill again or of referral.
- ●Safety netting such as "come back if you feel unwell" for a woman who feels brilliant when she is becoming high.
Mapped to the RCGP curriculum topic: Maternity and Reproductive Health.
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