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Doxycycline and CHC — DFSRH MCQ

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EasyPharmacologyDoxycycline and CHCDFSRH

A 25-year-old combined pill user is treated with doxycycline for chlamydia. She has no vomiting and takes pills correctly. What would you advise this patient?

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Correct answer: B — No extra contraception is needed because of doxycycline alone

Doxycycline is not an enzyme inducer and does not reduce CHC effectiveness by itself. Condoms are still advised for STI transmission and abstinence guidance after chlamydia treatment. Distinguish contraceptive interaction from infection-control advice.

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