FIELD: medicine.
SUBSTANCE: invention refers to medicine, gynaecology, birth control techniques used as and when necessary, and emergency contraception. Ulipristal acetate or its metabolite is administered orally in a female no more than 72 hours to 120 hours after a sexual encounter in a dose of 20 to 30 mg. Another dose can be administered again at least twice a month. The preparation can be administered either in the form of an immediate-release dosage form, in the form of a tablet.
EFFECT: method provides the high efficacy of emergency contraception even in low doses and late administration of the preparation - up to 120 hours after the sexual encounter as compared to a reference preparation of levonorgestrel.
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