Levonorgestrel 797-63-7

Levonorgestrel 797-63-7

Levonorgestrel is a manufactured hormone used in a number of birth control methods. In pill form, sold under the brand name Plan B among others, it is useful within 120 hours as emergency birth control. It becomes less effective the longer after sex and only works before pregnancy has occurred. It is also combined with an estrogen to make combined oral birth control pill. Within an IUD with progestogen, sold as Mirena among others, it is effective for long term prevention of pregnancy.[1] An implantable form of levonorgestrel is also available in some countries.

At low doses, levonorgestrel is used in monophasic and triphasic formulations of combined oral contraceptive pills, with available monophasic doses ranging from 100-250 µg, and triphasic doses of 50 µg/75 µg/125 µg.

At very low daily dose of 30 µg, levonorgestrel is used in some progestogen only pill formulations.

GMP for Levonorgestrel 797-63-7 is available.
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