Definition of levonorgestrel in English:



mass nounBiochemistry
  • A synthetic steroid hormone which has a similar effect to progesterone and is used in some contraceptive 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.’
    • ‘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.’
    • ‘It consists of the hormone levonorgestrel, a common ingredient in birth control pills.’
    • ‘Certain drugs such as corticosteroids, anti-epileptic medicines like phenytoin, and oral contraceptives containing levonorgestrel or norethisterone, may aggravate acne.’
    • ‘No studies have specifically compared mifepristone with levonorgestrel.’


1970s from levo- (it being a laevorotatory isomer) + norgestrel, a synthetic steroid hormone.