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When used as directed, Plan B® One-Step is safe and effective.

Some women may experience side effects similar to those of many birth control pills. These include:
  • Changes in your period
  • Nausea
  • Lower Abdominal Pain
  • Fatigue
  • Headache
  • Dizziness
  • Breast Tenderness

If you should experience severe abdominal pain, you may have an ectopic pregnancy and should get immediate medical attention.

The only way of knowing Plan B® One-Step has worked is when you get your next period, which should come at the expected time or within a week of the expected time. If your period is more than 7 days late, you may be pregnant.

Keep in mind, Plan B® One-Step is less likely to work if:

  • You have unprotected sex, or contraceptive failure again in the same menstrual cycle after taking Plan B® One-Step
  • You've already had unprotected sex, or contraceptive failure earlier in your menstrual cycle
  • You vomit within two hours of taking Plan B® One-Step (talk to your healthcare professional if this happens)