![]() However, in 2013, the rules were changed so that Plan B could be purchased at any age without ID or prescription. Plan B hit the market in 1999 where it could be bought by anyone older than 18. Planned Parenthood asserts "Taking the morning-after pill (also known as emergency contraception) multiple times doesn't change its effectiveness, and won't cause any long-term side effects." There is no age, I.D, or prescription required to purchase emergency contraception. ![]() However, taking more than one dose of emergency contraception does not increase the chance of pregnancy not happening. With one study indicating that beginning as late as 120 hours (5 days) after intercourse could be effective. The levonorgestrel-only method uses levonorgestrel 1.5 mg (as a single dose or as two 0.75 mg doses 12 hours apart) taken within three days of unprotected sex. Levonorgestrel is used in emergency contraceptive pills (ECPs), both in a combined Yuzpe regimen which includes estrogen, and as a levonorgestrel-only method. One IUD, the Mirena, is a small hollow cylinder containing levonorgestrel and polydimethylsiloxane and covered with a release rate controlling membrane. ![]() One of the more common forms of contraception that contains only levonorgestrel is an IUD. It is also the active ingredient in the birth control implants Norplant and Jadelle. Levonorgestrel is the active ingredient in a number of intrauterine devices including Mirena and Skyla. Īt very low daily dose of 30 µg, levonorgestrel is used in some progestogen-only pill formulations. It is combined with the estrogen ethinylestradiol in these formulations. See also: Ethinylestradiol/levonorgestrelĪt low doses, levonorgestrel is used in monophasic and triphasic formulations of combined oral contraceptive pills, with available monophasic doses ranging from 100 to 250 µg, and triphasic doses of 50 µg/75 µg/125 µg. In 2020, it was the 323rd most commonly prescribed medication in the United States, with more than 800 thousand prescriptions. In the United States, levonorgestrel-containing emergency contraceptives are available over the counter (OTC) for all ages. It is on the World Health Organization's List of Essential Medicines. Levonorgestrel was patented in 1960 and introduced for medical use together with ethinylestradiol in 1970. It works primarily by preventing ovulation and closing off the cervix to prevent the passage of sperm. It is a progestin and has effects similar to those of the hormone progesterone. ![]() Birth control that contains levonorgestrel will not change the risk of sexually transmitted infections. When used as an emergency contraceptive, if pregnancy occurs, there is no evidence that its use harms the fetus. Ĭommon side effects include nausea, breast tenderness, headaches, and increased, decreased, or irregular menstrual bleeding. A levonorgestrel-releasing implant is also available in some countries. In an intrauterine device (IUD), such as Mirena among others, it is effective for the long-term prevention of pregnancy. It decreases the chances of pregnancy by 57 to 93%. Levonorgestrel works by preventing ovulation or fertilization from occurring. The more time that has passed since sex, the less effective the medication becomes, and it does not work after pregnancy ( implantation) has occurred. As an emergency birth control, sold under the brand names Plan B One-Step and Julie, among others, it is useful within 72 hours of unprotected sex. It is combined with an estrogen to make combination birth control pills. Levonorgestrel is a hormonal medication which is used in a number of birth control methods.
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