Q:

How long does it take for Depo-Provera to become effective?

A:

Quick Answer

Depo-Provera becomes effective immediately if administered within the first five to seven days of the start of a woman's menstrual period. If the injection is administered at any other time, using a backup method of birth control is necessary for at least a week.

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Full Answer

Depo-Provera is a form of birth control that is administered as an injection every three months. Each injection contains a synthetic form of the hormone progestin. It works by blocking ovulation and thickening the cervical mucus to block sperm. It is 99 percent effective in preventing pregnancy when a woman receives injections regularly. This method of contraception does not provide protection against sexually transmitted diseases.

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Related Questions

  • Q:

    How long after using the Depo-Provera shot for six months does it take to be able to conceive?

    A:

    A woman may conceive as soon as three to four months after her last Depo-Provera shot, but conception may take as long as a year or two, according to WebMD. The length of time that a woman received Depo-Provera injections does not seem to impact this time frame.

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  • Q:

    What happens when stopping Depo-Provera?

    A:

    After stopping the use of Depo-Provera, women expect to resume menstruation within 1 to 3 months and their bones begin accumulating calcium again. Depo-Provera acts as a birth control, offering users options of receiving protection in the form of shots, which they inject every 11 weeks. While using Depo-Provera, bone growth slows and menstruation stops, a condition called amenorrhea, but these effects reverse within several months of the last shot.

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  • Q:

    How do you stop bleeding on Depo-Provera?

    A:

    Estrogen replacement and tranexamic acid are two medications that may be helpful in stopping the bleeding caused from a Depo-Provera shot, according to About Health. When continuous bleeding occurs following a Depo-Provera shot, speak with a doctor to determine if these options are right for the situation.

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  • Q:

    How long does Depo-Provera stay in your system?

    A:

    According to Pfizer, immediately after application, Depo-Provera plasma concentration reaches 1.7 nanomole per liter and falls to that initial level after 12 weeks. NHS Choices states there is no definitive agreement about when the drug completely leaves the system; ovulation is inhibited up to five and half months after application.

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