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Plan B Risks

Although many women do not experience problems while taking Plan B One-Step™ (levonorgestrel), this medication is not free of risks. Some of the most common risks with Plan B include:
If any problems do occur, they tend to be minor and either require no treatment or are easily treated by you or your healthcare provider. However, there are some potentially serious Plan B risks that require immediate medical attention. Contact your healthcare provider if you experience serious problems such as:
  • Vomiting within one hour of taking Plan B
  • Severe abdominal pain (stomach pain)
  • Difficulty breathing.
Other warnings and precautions apply to women who are pregnant or breastfeeding, as well as people who have certain allergies (including allergies to foods, dyes, or preservatives). Also, you may not be able to take Plan B if you have certain medical conditions, such as diabetes.
(Click Plan B Side Effects and Plan B Warnings and Precautions for more information on possible risks with Plan B to be aware of, including potentially serious problems that may require immediate medical care.)
Last reviewed by: Kristi Monson, PharmD
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