A member asked:

What exactly is the shot, used for contraception? how does it work? how long does it last? are there any side effects? can anyone use it?

A doctor has provided 1 answer

Depo (hormone): The contraception shot is known as depo-provera or dmpa. It is a hormone similar to one made by the body called progesterone. It works primarily by preventing ovulation, the release of an egg from the ovary. One shot lasts for 3 months. Possible side effects: changes in menstruation, weight gain, and headache. Depo is not right for everyone - discuss with your dr. If this is a good choice for you.

Answered 12/9/2013

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