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Carbamazepine contraception — GPhC CRA MCQ

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ModerateCNS TherapeuticsCarbamazepine contraceptionGPhC CRA

A woman taking carbamazepine starts a combined oral contraceptive from an online provider. What is the most important interaction to flag?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Carbamazepine can reduce contraceptive efficacy through enzyme induction

Carbamazepine induces hepatic enzymes and can lower hormonal contraceptive exposure. In this scenario, the pharmacist should prioritise safe supply, appropriate counselling and timely referral or clarification where needed. This is the single best answer because the other options would either delay assessment, ignore a clinically significant risk, or create an unsafe legal or professional outcome.

Reference: BNF; FSRH