Method of inhibiting fertilization

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Cyclopentanohydrophenanthrene ring system doai

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514843, A61K 3156

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active

055167691

ABSTRACT:
Fertilization of an oocyte is inhibited by administering a fertilizing inhibitory amount of an antiprogestin to an ovulatory mammal in an amount which is insufficient to prevent ovulation but sufficient to inhibit fertilization, while the regularity of the menstrual cycle is sustained.

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