<P> The World Health Organization (WHO) lists no medical condition for which the risks of emergency contraceptive pills outweigh the benefits . The American Academy of Pediatrics (AAP) and experts on emergency contraception have concluded that progestin - only ECPs may be preferable to combined ECPs containing estrogen in women with a history of blood clots, stroke, or migraine . </P> <P> There are no medical conditions in which progestin - only ECPs are contraindicated . Current venous thromboembolism, current or past history of breast cancer, inflammatory bowel disease, and acute intermittent porphyria are conditions where the advantages of using emergency contraceptive pills generally outweigh the theoretical or proven risks . </P> <P> ECPs, like all other contraceptives, reduce the absolute risk of ectopic pregnancy by preventing pregnancies and there is no increase in the relative risk of ectopic pregnancy in women who become pregnant after using progestin - only ECPs . </P> <P> The herbal preparation of St John's wort and some enzyme - inducing drugs (e.g. anticonvulsants or rifampicin) may reduce the effectiveness of ECP, and a larger dose may be required . </P>

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