Ulipristal acetate: a guide to its use in emergency contraception

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Ulipristal acetate, the first of a new class of selective progesterone receptor modulators, is indicated for emergency contraception within 120 hours of unprotected sexual intercourse or contraceptive failure. In clinical trials, a single oral dose of ulipristal acetate was effective in preventing pregnancies in women requesting emergency contraception and provided sustained efficacy throughout the 120-hour postcoital period.

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