Levonorgestrel

Levonorgestrel is a synthetic hormone used in many forms of birth control. It is a progestin that works by preventing ovulation, thickening cervical mucus, and thinning the lining of the uterus. It can be taken orally, as an implant, or as an intrauterine device. It is also often used in emergency contraception, also known as the morning-after pill.

Levonorgestrel is a synthetic hormone medication used for a few key purposes in women's health:

• Emergency Contraception (EC): This is the most well-known use of levonorgestrel. It's a hormonal emergency contraceptive sold under brand names like Plan B One-Step and Preventeza, among others [1]. It's effective within 72 hours (3 days) of unprotected sex to prevent pregnancy [1, 2].
• Regular Birth Control: Levonorgestrel is also combined with a low dose of estrogen in some birth control pills to prevent pregnancy through a different mechanism [2].

How Levonorgestrel Works for Emergency Contraception (EC):

• Levonorgestrel works primarily by preventing ovulation (the release of an egg from the ovary) or fertilization (the sperm meeting the egg) if sex has already occurred [1, 2].
• It's important to note that levonorgestrel is not effective if you are already pregnant; it will not terminate a pregnancy [2].

Important things to remember about Levonorgestrel for EC:

• Effectiveness: Levonorgestrel for EC is most effective the sooner you take it after unprotected sex. Its effectiveness decreases the longer you wait to take it after sex [1, 2].
• Not a Regular Birth Control Method: EC is meant as a backup method, not a regular form of birth control. It's best to discuss reliable birth control options with your doctor if needed [2].
• Availability: Levonorgestrel EC is available over-the-counter in many places, but some regions may require a prescription [2].