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Plan B Pill: Your Comprehensive Guide to Emergency Contraception
Medically reviewed by Veronica Hackethal | MD, MSc, Harvard University | University of Oxford | Columbia Vagelos College of Physicians and Surgeons on March 9th, 2026.
Published on February 1st, 2026. Updated on April 30th, 2026.
2 min
Key takeaways
Plan B is 75-89% effective when taken within 3 days of unprotected sex
Available over-the-counter without age or gender restrictions
Can be taken up to 5 days after unprotected intercourse
Different from abortion medication, it prevents pregnancy before fertilization
Emergency contraception represents an important reproductive health option for individuals seeking to prevent unintended pregnancy. The Plan B pill offers a safe, accessible method for those who need immediate pregnancy prevention after unprotected sexual activity or potential contraceptive failure.
Plan B contains levonorgestrel, a synthetic hormone that works primarily by delaying ovulation. When you seek emergency contraception, understanding how this medication functions can help reduce anxiety and make informed decisions.
Understanding Emergency Contraception Mechanisms
Emergency contraception is not the same as an abortion pill. Plan B prevents pregnancy by stopping or delaying ovulation, which means it stops an egg from being released from the ovary. If no egg is available, fertilization cannot occur. The medication works most effectively when taken as soon as possible after unprotected sexual activity.
Effectiveness and Timing
The effectiveness of Plan B decreases over time. Within the first 24 hours, the pill can be up to 95% effective in preventing pregnancy. This effectiveness gradually reduces to approximately 75-89% if taken within three days. When taking other medications such as adapalene, consult healthcare professionals about potential interactions.
Potential Side Effects
Most individuals experience minimal side effects with Plan B. Common temporary symptoms might include:
Slight changes in menstrual cycle
Mild headaches
Temporary nausea
Potential breast tenderness
Cost and Accessibility
Plan B Option |
Average Cost |
Availability |
Prescription Required |
|---|---|---|---|
Brand Name (Plan B One-Step) |
$40-$50 |
Pharmacies, Online |
No |
Generic Alternatives |
$11-$45 |
Drugstores |
No |
Online Order (AfterPill) |
$25 |
Internet |
No |
Important Medication Interactions
Certain medications can potentially reduce Plan B's effectiveness, such as bactrim or other specific medications that might interfere with emergency contraception. Consult a healthcare provider about potential interactions.
Frequently Asked Questions
Who can use Plan B?
Anyone of any gender can purchase Plan B without age restrictions or identification requirements.
Is Plan B an abortion pill?
No, Plan B prevents pregnancy before fertilization and is not a medical abortion.
How quickly should I take Plan B?
Take it as soon as possible after unprotected sex, preferably within 24 hours.
Does weight affect Plan B's effectiveness?
Individuals weighing over 165 pounds might experience reduced effectiveness.
Can I use Plan B multiple times?
While safe, it's not recommended as a regular contraception method.
The Bottom Line
Emergency contraception provides an important reproductive health option. Understanding its mechanisms, effectiveness, and proper usage empowers individuals to make informed decisions about their sexual health.
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