How Long Does the Depo Provera Shot Last?

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By Priscilla Benfield
eHow Contributing Writer

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Depo Provera (medroxyprogesterone acetate) is an injectable method of birth control. According to Planned Parenthood, Depo Provera is as effective as the birth control pill, patch or ring in preventing pregnancy. The costs of the injection ranges from $35 to $70, plus the cost of the exam.

How it Works

According to the Family Doctor website, the Depo Provera shot works by preventing ovulation. If an egg is not released, pregnancy cannot occur.

Time Frame

In order to be effective, the Depo Provera shot must be given within the first five days of a woman's menstrual cycle. If you wait to get the shot, a pregnancy test must be done before getting the injection.

Length of Protection

The Depo Provera shot is effective against pregnancy for 12 weeks. The shot must be repeated at 12-week cycles to maintain protection against pregnancy.

Side Effects

According to Planned Parenthood, some side effects include menstrual irregularities or lack of menses, abdominal pain, weight changes, dizziness and headache. Heavy bleeding or severe abdominal pain should be reported to your doctor.

Risks

Depo Provera does not protect against HIV or sexually transmitted diseases. A condom should be used to protect against disease.

Warning

Long-term use of Depo Provera can cause loss of bone mineral density. According to the Rx List website, Depo Provera should not be used for longer than two years unless no other suitable birth control choice is available.