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Levonorgestrel-containing refers to products or medications that contain levonorgestrel as their active pharmaceutical ingredient. Levonorgestrel is a synthetic progestogen, a type of hormone that mimics the effects of progesterone in the body. It is widely used in various forms of hormonal contraception and hormone replacement therapy.

Common applications of levonorgestrel include emergency contraception, often referred to as the "morning-after pill," which can prevent pregnancy if taken within a specific timeframe after unprotected intercourse. It is also a key component in several types of hormonal intrauterine devices (IUDs). These IUDs release levonorgestrel locally into the uterus, providing long-term contraception and also being used to treat heavy menstrual bleeding. Furthermore, levonorgestrel is found in some birth control pills, either alone or in combination with estrogen.

The mechanism of action for levonorgestrel varies depending on the dosage and administration method. In contraceptives, it primarily works by preventing ovulation, thickening cervical mucus to impede sperm from reaching the egg, and altering the uterine lining to make implantation less likely. Its use is typically prescribed by a healthcare professional who can assess its suitability for an individual's health needs and reproductive goals. Side effects can occur and may include changes in menstrual bleeding patterns, breast tenderness, headaches, and mood changes, although not everyone experiences them.