Antibiotics and combined hormonal contraception — GPhC CRA MCQ
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Correct answer: E — Extra contraception is not routinely needed unless vomiting or diarrhoea affects pill absorption
Most non-enzyme-inducing antibiotics do not reduce combined oral contraceptive efficacy. Vomiting or severe diarrhoea can affect absorption, so missed-pill guidance may apply. Enzyme-inducing medicines are different and require specific contraceptive advice. Phenoxymethylpenicillin is not an enzyme inducer.
Reference: FSRH; BNF