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Enzyme-inducing medication and contraception — DRCOG MCQ

Instant feedback + full explanation. One question, done properly.

HardContraception and Sexual HealthEnzyme-inducing medication and contraceptionDRCOG

A 35-year-old woman wants an implant. She takes carbamazepine for epilepsy and has regular menses. She wants a method that remains highly reliable with her medication. What would you advise?

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

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Correct answer: D — Use a copper IUD or levonorgestrel IUS instead

Carbamazepine is an enzyme inducer and can reduce effectiveness of some hormonal methods, including the implant; intrauterine methods are preferred for reliable contraception. Standard-dose combined pills are also affected and may be unsuitable depending on risk factors. The pearl is that drug interactions are a central part of contraceptive counselling.

Reference: FSRH Drug Interactions with Hormonal Contraception; FSRH UKMEC 2025