Hormonal Injection Birth Control

Hormonal injection for birth control works by suppressing the egg from coming out of the ovary every month (ovulation). Protection begins immediately after the first shot if given during a menstrual period. They are 99% effective in preventing birth.

However, it is not recommended for women who have:

  • unexplained vaginal bleeding
  • liver disease
  • breast cancer
  • chest pains, stroke or heart attack
  • breastfeeding
  • suspicion of being pregnant

Side effects include:

  • Irregular menstrual periods or no periods
  • Headaches
  • Nervousness
  • Depression
  • Dizziness
  • Acne (pimples)
  • Changes in appetite
  • Weight gain
  • Excessive growth of facial and body hair
  • Hair loss
Most common side effect is irregular bleeding or spotting. After about a year of use many women will not have periods. Their periods usually return when the injection is stopped. Women who continue to get their periods often have lighter bleeding.

Some women may not get pregnant after stopping the injections. It may take up to 2 years to conceive.

You need to stop taking hormone shots several months ahead of time if you plan to become pregnant.

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