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Carbamazepine contraception — GPhC CRA MCQ

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ModerateDrug InteractionsCarbamazepine contraceptionGPhC CRA

A woman using a combined oral contraceptive is prescribed carbamazepine by neurology. What is the most important interaction to flag?

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Correct answer: E — Carbamazepine can reduce contraceptive hormone exposure and efficacy

Carbamazepine induces enzymes and reduces exposure to hormonal contraception. 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