Progesterone only injection

A progesterone only contraceptive injection contains a high dose of a synthetic progestogen like medroxyprogesterone that is injected once in three months for contraception. These injections inhibit ovulation, growth and thickening of the endometrium and thinning of cervical mucus; they also suppress menstruation if used continually.

Progesterone only injection acts on the endometrium in all its locations to stop it growing and can therefore be used to treat endometriosis, which is growth of endometrial tissue outside the uterus, causing pain and bleeding.
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