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Medically reviewed by Veronica Hackethal | MD, MSc, Harvard University | University of Oxford | Columbia Vagelos College of Physicians and Surgeons on March 10th, 2026.
Plan B is a time-sensitive emergency contraceptive with up to 95% effectiveness
Medication works by preventing or delaying ovulation within 72 hours
Generally safe with minimal side effects
Available over-the-counter without age restrictions
Emergency contraception has become an essential component of reproductive healthcare, providing women with a crucial option when regular birth control alternatives fail or are unavailable. Plan B, commonly referred to as "Plan B pastilla" in Spanish-speaking communities, represents one of the most widely recognized forms of emergency contraception available today.
The medication offers women a time-sensitive opportunity to prevent unintended pregnancy after unprotected sexual intercourse or birth control failure. Its accessibility and effectiveness make it an important safety net in family planning decisions.
Plan B One-Step is an emergency contraceptive pill containing 1.5 milligrams of levonorgestrel, a synthetic hormone. This medication functions primarily by preventing or delaying ovulation. When taken within the recommended timeframe, Plan B disrupts the normal hormonal signals that trigger ovulation, effectively preventing fertilization from occurring.
The mechanism involves temporarily suppressing the luteinizing hormone surge that normally triggers egg release. If ovulation has not yet occurred, Plan B can delay it for several days, allowing sperm to lose their viability before an egg becomes available for fertilization.
The effectiveness of Plan B is critically time-dependent. Clinical studies demonstrate the following effectiveness rates:
Timeframe |
Pregnancy Prevention Rate |
|---|---|
Within 24 hours |
95% |
25-48 hours |
85% |
49-72 hours |
58% |
Importantly, the medication is most effective when taken as soon as possible after unprotected intercourse. Users should take one tablet quickly, with or without food. How soon after unprotected sex you take Plan B directly impacts its effectiveness.
Most users experience minimal side effects. Common temporary reactions include:
Menstrual irregularities
Mild nausea
Fatigue
Headache
Breast tenderness
Serious complications are extremely rare, but users should consult healthcare providers if they experience severe abdominal pain or signs of allergic reaction. Women with a history of birth control and blood clots should discuss additional considerations with their healthcare provider.
Plan B is available over-the-counter without age restrictions in the United States. While convenient, it should not replace regular contraception. Women who frequently need emergency contraception should consult healthcare providers about more consistent birth control pill options.
No, Plan B prevents pregnancy and does not terminate an existing pregnancy.
While safe, it should not be used as a regular contraceptive method. Frequent use is not recommended.
No scientific evidence suggests Plan B impacts long-term fertility.
Consult your healthcare provider, but it is generally considered safe.
No, it is available over-the-counter without age restrictions.
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