Depo- Provera (medroxyprogesterone): Depo- Provera (medroxyprogesterone) has 99% efficacy in preventing pregnancy. It must be given every 12 weeks to insure protection. A woman might become pregnant 3 to 4 months after the last Depo – Provera (medroxyprogesterone) shot. But it could take 6 months up to as long as two years.
Answered 5/8/2015
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