Using Plan B more than once in the same month can be harmful to your health, even though taking it occasionally usually does not cause serious problems. Plan B contains high doses of hormones, and frequent use increases the risk of side effects.
Taking Plan B too often may lead to side effects such as:
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Irregular periods and heavy or prolonged vaginal bleeding
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Nausea and/or vomiting
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Headache or dizziness
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Fatigue
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Lower abdominal pain
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Weight gain and/or higher blood pressure
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Increased cholesterol and/or blood sugar levels
Because of these risks, Plan B should only be used in emergency situations, not as a regular method of birth control. If you are not currently using any form of contraception, it is important to talk to a gynecologist, who can recommend the most suitable options for your needs.
Plan B may delay your period in some women. Temporary changes to the menstrual cycle are a common side effect after taking this medication.
The effectiveness of Plan B is greater the sooner it is taken. Although pregnancy is rare when it is used correctly, Plan B can fail in some cases. If your period is more than 7 days late, it is best to see a gynecologist to check if you might be pregnant.