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Side Effects of the Morning After Pill

The morning after pill, also known as Plan B or emergency contraception, is an oral contraceptive that can prevent pregnancy if taken up to 72 hours after unprotected sex. Side effects are similar to those of traditional birth control pills and, for most women, side effects are minor and temporary.

  1. Minor Side Effects

    • Minor side effects of the morning after pill may include abdominal pain, breast tenderness, diarrhea, dizziness, fatigue, headache and nausea.

    Menstrual Side Effects

    • The timing or heaviness of your next period may be affected. Menstruation may be lighter, heavier or delayed after taking the morning after pill.

    Serious Side Effects

    • The morning after pill can change blood sugar levels, which is potentially dangerous to diabetics. Severe abdominal pain is considered a serious side effect and may be an indication of ectopic pregnancy.

    Ectopic Pregnancy

    • Ectopic pregnancies occur when a fertilized egg attaches outside of the uterus. If the morning after pill fails to prevent pregnancy, ectopic pregnancy is possible.

    Time Frame

    • Because the hormones from the morning after pill are in your system for less time than traditional oral contraceptives, there are fewer long-term side effects. The morning after pill is not recommended as a regular contraceptive method.

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