Advice on antibiotics and hormonal contraceptives changed

Women taking combined oral contraceptives do not need to take extra contraceptive precautions during and after antibiotic courses of 3 weeks or less unless they have diarrhoea or vomiting, according to new guidance about drug interactions with hormonal contraceptives highlighted by the National Prescribing Centre (NPC). The exception is for antibiotics such as rifampicin that are enzyme inducers, for which additional precautions are still advised.