Psychiatric Medication Counselling OSCE — SSRIs, Antipsychotics, Lithium Monitoring

Why This Station Is Tested

Psychiatric medication counselling stations assess your ability to explain complex medication information clearly, address common concerns, and support adherence. These stations appear in psychiatry, primary care, and internal medicine OSCEs. Common scenarios include starting an antidepressant, initiating an antipsychotic, or counselling on lithium monitoring.

Counselling Framework

Use the ICE-EXPLAIN-SAFETY NET structure:

1. 1Elicit the patient's Ideas, Concerns, Expectations about medication before starting
2. 2Explain the medication in plain language: what it does, how to take it, when to expect effects
3. 3Cover side effects (common first, then serious)
4. 4Safety-net: when to seek urgent help, what not to stop suddenly

SSRIs (e.g. Sertraline, Fluoxetine, Citalopram)

How they work (lay language): "This medication helps balance chemicals in your brain — particularly serotonin — that are involved in mood. It does not change your personality or make you dependent on it."

Key counselling points:

• Take daily, same time each day, with or without food
• Full effect takes 2–4 weeks — common error is stopping too early thinking it isn't working
• Side effects mostly occur in the first 1–2 weeks: nausea, headache, insomnia, increased anxiety initially
• Do not stop suddenly — taper over weeks to avoid discontinuation syndrome (flu-like symptoms, electric shock sensations)
• Avoid in pregnancy (especially fluoxetine and paroxetine — check current guidance)
• Serotonin syndrome risk with tramadol, triptans, St John's Wort — warn explicitly
• Review at 2 weeks (for side effects) then 4–6 weeks (for efficacy)

Antipsychotics

Typical (first-generation): haloperidol, chlorpromazine — higher EPS risk

Atypical (second-generation): olanzapine, risperidone, quetiapine, aripiprazole, clozapine

Key side effects to counsel on:

Lithium — Monitoring and Counselling

Lithium has a narrow therapeutic index (0.4–1.0 mmol/L for maintenance; 0.8–1.0 for acute mania).

Monitoring schedule:

• Baseline: renal function, TFTs, ECG, weight
• After initiation: lithium level 12 hours post-dose at 5–7 days then at 6 months
• Ongoing: renal function and TFTs every 6 months; lithium level every 6 months if stable

Toxicity signs (level >1.5 mmol/L): coarse tremor, vomiting, diarrhoea, confusion, ataxia → STOP and check levels urgently

Counselling points: maintain good hydration (dehydration raises lithium levels), avoid NSAIDs and ACE inhibitors (raise lithium), carry a lithium card, do not stop suddenly (rebound mania).

Frequently Asked Questions

"What are the most important counselling points when starting an SSRI?"

When starting an SSRI, the five most important counselling points are: first, that the full antidepressant effect takes 2–4 weeks and the patient should not stop if they feel no improvement in the first week; second, that common early side effects (nausea, initial worsening of anxiety, insomnia) usually resolve within 1–2 weeks; third, that the medication should never be stopped suddenly — it must be tapered to avoid discontinuation syndrome; fourth, that SSRIs should be taken daily at the same time regardless of mood; and fifth, that a review appointment should be booked at 2 weeks to check tolerability and again at 6 weeks to assess efficacy. In an OSCE, also ask about suicidal ideation at baseline — SSRI initiation can transiently increase this in young adults.

"What is lithium toxicity and how do you recognise it?"

Lithium toxicity occurs when the serum level exceeds 1.5 mmol/L. Early features include coarse tremor (different from the fine tremor at therapeutic levels), nausea, vomiting, diarrhoea, drowsiness, and muscular twitching. Severe toxicity (>2.0 mmol/L) produces confusion, ataxia, dysarthria, seizures, and cardiac arrhythmias. Common precipitants include dehydration, diarrhoea and vomiting, introduction of NSAIDs or ACE inhibitors, or missed monitoring. Management: stop lithium immediately, check serum lithium level urgently, rehydrate, and consider haemodialysis in severe cases. In the OSCE, if asked about lithium toxicity, always mention the narrow therapeutic window and the importance of maintaining hydration.

"What are extrapyramidal side effects and how do you counsel patients about them?"

Extrapyramidal side effects (EPS) are movement disorders caused by dopamine D2 receptor blockade in the basal ganglia. They include: acute dystonia (sustained muscle spasm, often of the face, neck, or trunk — occurs within hours to days); akathisia (distressing inner restlessness, inability to sit still — a common cause of non-adherence); parkinsonism (bradykinesia, rigidity, tremor); and tardive dyskinesia (repetitive involuntary movements of the face and tongue — occurs after months to years and may be irreversible). When counselling, explain these possibilities in plain language and reassure that acute dystonia responds rapidly to procyclidine. Encourage the patient to report any unusual movements immediately.

"What monitoring is required for clozapine and why?"

Clozapine requires mandatory regular blood monitoring because it carries a risk of agranulocytosis — a dangerous drop in white blood cells (specifically neutrophils) that can be fatal if undetected. Monitoring schedule: weekly FBC for the first 18 weeks, then fortnightly for 1 year, then monthly thereafter. The patient must be registered with the Clozaril Patient Monitoring Service (CPMS) and results entered before each prescription is released. In an OSCE station on clozapine counselling, also cover: metabolic syndrome monitoring (weight, glucose, lipids), hypersalivation (very common — managed with hyoscine), myocarditis risk (echocardiogram and troponin in the first 4 weeks), and severe constipation (can lead to bowel obstruction).

"How do you counsel a patient who wants to stop their antidepressant?"

First, explore why they want to stop — is it side effects, feeling better, cost, or stigma? Address the underlying concern before discussing the medication itself. Explain that stopping antidepressants suddenly can cause discontinuation syndrome (flu-like symptoms, dizziness, electric shock sensations, irritability) and that this can be avoided by tapering slowly over 4–8 weeks. For those who have had a first episode, guidelines recommend continuing for at least 6 months after remission; for those with recurrent depression, 2 years or longer. Check whether the patient still has residual symptoms — stopping too early is associated with high relapse rates. Agree a shared plan and book a follow-up review.

"What drug interactions must you always mention when counselling on psychiatric medications?"

The highest-yield interactions to know for OSCEs: SSRIs interact with tramadol, triptans, linezolid, and St John's Wort to cause serotonin syndrome — counsel patients to avoid these. MAOIs interact with almost everything including SSRIs, tyramine-rich foods (cheese, red wine), and sympathomimetics — a 2-week washout is required when switching. Lithium levels are raised by NSAIDs (even ibuprofen), ACE inhibitors, thiazide diuretics, and dehydration — patients must carry a lithium card and avoid self-medicating with NSAIDs. Antipsychotics prolong the QTc interval — avoid combination with other QTc-prolonging drugs (macrolides, methadone, antifungals).

Related guides: Psychiatric History OSCE · Depression and Anxiety History OSCE · Mental State Examination OSCE · Consent and Capacity OSCE · Explaining a Diagnosis OSCE