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One of a group of naturally occurring or synthetic hormones that maintain the normal course of pregnancy. The best known is progesterone. In high doses progestogens inhibit secretion of luteinizing hormone, thereby preventing ovulation, and alter the consistency of mucus in the vagina so that conception tends not to occur. They are therefore used as major constituents of oral contraceptives.

Subjects: Clinical Pharmacology and Therapeutics — Chemistry.

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