When taken as directed, Plan B One-Step® is generally safe and effective.
Some women will experience side effects, which may include:
- Menstrual changes
- Lower stomach (abdominal) pain
- Breast tenderness
Some women taking Plan B One-Step® will have menstrual changes such as spotting or bleeding before their next period. For some
women, their next period may be heavier or lighter, or they may have a period that is early or late.
A pregnancy test should be given if a period is more than one week late.
Severe abdominal pain may be a sign of an ectopic pregnancy, for which immediate medical attention is required.