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How Does Plan B Work
Plan B, also known as the morning-after pill, is a form of emergency contraception that can prevent pregnancy if taken within a certain timeframe after unprotected sex or contraceptive failure. Understanding how Plan B works is essential for individuals who may need to use it in a time-sensitive situation. In this article, we will delve into the mechanism of action of Plan B and explore its effectiveness and safety.
What is Plan B?
Plan B is a progestin-only emergency contraceptive pill that contains levonorgestrel, a synthetic hormone that is similar to the hormone progesterone produced by the ovaries. It is available over-the-counter without a prescription for individuals of all ages. Plan B is designed to prevent pregnancy by delaying or inhibiting ovulation, fertilization, or implantation of a fertilized egg in the uterus.
How Does Plan B Work?
Plan B primarily works by preventing ovulation, the release of an egg from the ovary, which is necessary for fertilization to occur.
. By delaying or inhibiting ovulation, Plan B reduces the likelihood of sperm encountering an egg for fertilization. Additionally, Plan B may also thicken cervical mucus, making it more difficult for sperm to reach the egg, and thin the lining of the uterus, potentially preventing implantation of a fertilized egg.
Effectiveness of Plan B
Plan B is most effective when taken as soon as possible after unprotected sex or contraceptive failure. According to the manufacturer, Plan B is up to 89% effective in preventing pregnancy if taken within 72 hours of unprotected sex. However, its effectiveness decreases over time, so it is crucial to take it as soon as possible for the best chance of preventing pregnancy.
- Within 24 hours: 95% effective
- Within 48 hours: 85% effective
- Within 72 hours: 89% effective
Safety of Plan B
Plan B is generally safe and well-tolerated, with few serious side effects. Common side effects may include nausea, abdominal pain, fatigue, headache, and menstrual changes. It is important to note that Plan B does not protect against sexually transmitted infections (STIs) and should not be used as a regular form of contraception.
Conclusion
In conclusion, Plan B is an effective form of emergency contraception that works by preventing ovulation, fertilization, and implantation of a fertilized egg. It is most effective when taken as soon as possible after unprotected sex or contraceptive failure. While Plan B is generally safe, it is not a substitute for regular contraception and does not protect against STIs. Understanding how Plan B works and its effectiveness is crucial for individuals who may need to use it in an emergency situation.
For more information on emergency contraception, visit Planned Parenthood.
