According to the search results, taking Plan B (levonorgestrel) multiple times does not change its effectiveness, and it wont cause any long-term side effects. There is no known limit on the number of times you can safely use Plan B. However, taking Plan B repeatedly will expose you to higher hormone levels than standard contraceptive methods, and is likely to cause more side effects, such as menstrual changes, headache, or abdominal pain. While there are no long-term side effects of frequently using Plan B, it may be less effective at preventing pregnancy than other birth control methods. The most significant risk of long-term Plan B use is actually pregnancy. According to a 2019 review, people who use emergency contraceptive pills on a regular basis have a 20 to 35 percent chance of becoming pregnant within a year.
In summary, taking Plan B multiple times is safe and does not cause any long-term side effects. However, it may be less effective at preventing pregnancy than other birth control methods, and taking it repeatedly can cause more side effects. It is not recommended to use Plan B as a regular method of birth control, and long-term birth control methods are significantly more effective at preventing pregnancy and are often cheaper.
