Medically reviewed by Alan Lucks | MD, Alan Lucks MDPC Private Practice - New York on March 5th, 2026.
Plan B prevents pregnancy when taken within 72 hours of unprotected intercourse
Available over-the-counter without age restrictions
Most effective when used as soon as possible after unprotected intercourse
Does not terminate an existing pregnancy
Emergency contraception represents a critical option for individuals seeking to prevent unintended pregnancy. Plan B offers a safe, accessible solution when primary contraception fails or is unavailable. Understanding how this medication works can help people make informed decisions about their reproductive health.
Plan B contains levonorgestrel, a synthetic hormone that primarily works by preventing ovulation and birth control interactions. When taken within the recommended timeframe, the medication can reduce pregnancy risk by up to 95 percent when used within 24 hours. The side effects of birth control are similar to those of emergency contraception, including potential menstrual cycle changes.
Plan B is now widely available over-the-counter at pharmacies, grocery stores, and healthcare facilities. The medication typically costs between $40 and $50 per dose, with some insurance plans providing coverage. Otc birth control options have expanded accessibility for many individuals seeking reproductive healthcare solutions.
Factor |
Details |
|---|---|
Optimal Timeframe |
Within 24 hours |
Maximum Effectiveness Window |
72 hours |
Weight Considerations |
Less effective over 165 pounds |
Dosage |
Single 1.5 mg tablet |
Individuals should take Plan B as soon as possible after unprotected intercourse. The medication works best before ovulation and does not terminate existing pregnancies. Those with long-term side effects of birth control pills should consult a healthcare provider for personalized guidance.
Common side effects include:
Temporary menstrual cycle changes
Mild nausea
Fatigue
Headache
Abdominal discomfort
Most side effects are mild and resolve within a few days. Severe abdominal pain or persistent symptoms warrant medical attention.
No, Plan B prevents pregnancy and does not terminate an existing pregnancy.
The medication begins working immediately but is most effective when taken within 24 hours.
While safe, it should not replace regular contraception. Repeated use is less effective and more expensive.
Yes, effectiveness may decrease for individuals weighing over 165 pounds.
No, Plan B is available over-the-counter for all ages.
Emergency contraception provides an important option for reproductive healthcare. Understanding how Plan B works can help individuals make informed decisions during critical moments.
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Emergency contraception represents a critical option for individuals seeking to prevent unintended pregnancy. Plan B offers a safe, accessible solution when primary [...]
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