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Levonorgestrel, often known as Plan B One-Step, is an emergency contraceptive designed to prevent pregnancy following unprotected intercourse or a failure in birth control, such as a broken condom. It is crucial to understand that this medication is intended for occasional use and is not suitable as a regular birth control method. Levonorgestrel should be taken within 72 hours of unprotected sex to be effective. The drug operates by temporarily halting the release of an egg from the ovaries, obstructing sperm from reaching the uterus, and preventing a fertilized egg from implanting in the uterus. However, it will not terminate an existing pregnancy nor will it offer protection against sexually transmitted infections (STIs) like HIV, gonorrhea, or chlamydia. It is important to note that Levonorgestrel's efficacy may be reduced in women over a certain weight (typically over 164 pounds or 74 kilograms) or if certain medications have been used recently. For personalized advice, it is advisable to consult a healthcare professional to determine if Levonorgestrel is appropriate for your situation. Always review the product's ingredients on the label, even if you have used it before, as formulations may change, and products with similar names might contain different components intended for other purposes. Ensure you are using the correct product to avoid potential harm.