Possible side effects

Wondering how taking Plan B might affect you? We've got you. Plan B is safe and effective. Some women may experience side effects from taking Plan B; these side effects tend to be mild. Remember: Plan B doesn't stay in your body long term, and it contains levonorgestrel - the same ingredient found in many popular birth control pills.

Possible side effects include:

  • A period that’s lighter, heavier, early, or late
  • Nausea
  • Lower abdominal cramps
  • Tiredness
  • Headache
  • Dizziness
  • Breast tenderness
  • Vomiting

Some women taking Plan B One-Step may have changes in their period, such as spotting or bleeding before their next period. If your period is more than a week late, it’s possible you might be pregnant. Get a pregnancy test and follow up with your healthcare professional.

If you vomit within 2 hours of taking Plan B, talk to your healthcare professional to find out if you should repeat the dose.

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