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No studies have specifically compared mifepristone with levonorgestrel .
It consists of the hormone levonorgestrel , a common ingredient in birth control pills.
Plan B uses a form of the synthetic hormone progestin, called levonorgestrel , to block ovulation and fertilization of the egg in a process similar to what happens with use of traditional birth control pills.
We have Progestasert (a progesterone IUD), which is still available as well as the newer Mirena, which relies on the hormone levonorgestrel , a synthetic progesterone.
Certain drugs such as corticosteroids, anti-epileptic medicines like phenytoin, and oral contraceptives containing levonorgestrel or norethisterone, may aggravate acne.
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