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Enzyme-inducing antiepileptic and emergency contraception — GPhC CRA MCQ

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HardCNS TherapeuticsEnzyme-inducing antiepileptic and emergency contraceptionGPhC CRA

A 29-year-old woman with epilepsy takes carbamazepine 400mg twice daily and asks for contraception after a condom failure yesterday. She would prefer tablets and declines copper IUD discussion initially. What is the most appropriate alternative?

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

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Correct answer: C — Discuss copper IUD as most effective and refer for same-day sexual health advice

Carbamazepine is an enzyme inducer and can reduce the effectiveness of oral emergency contraception. The copper IUD is the most effective emergency contraception and is not affected by enzyme induction. If oral treatment is chosen, specialist guidance on dosing and suitability is needed.

Reference: FSRH guidance; BNF