Method of Pregnancy Prevention by Competitive Progesterone Antagonists and Similar, Novel Compounds

摘要

Competitive progesterone antagonists, including two novel steroids, viz., 11beta,19-[4-(cyanophenyl)-o-phenylene]-17beta-hydroxy-17alpha-(3-hydroxyprop-1(Z)-enyl)-4-androsten-3-one and 11beta,19-[4-(3-pyridinyl)-o-phenylene]-17beta-hydroxy-17alpha-(3-hydroxyprop-1(Z)-enyl)-4-androsten-3-one, inhibit formation of endometrial glands at below their ovulation inhibiting dose and the abortive dose, and thus achieve oral contraception in females without adversely affecting the menstrual cycle and without risk of aborting a previous implanted fertilized egg or a fetus.