Luis E. Miramontes signed laboratory notebook. October 15, 1951
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Levonorgestrel

A progestin is a synthetic progestagen. These particular synthetic hormones are most often used in the production of contraceptives. more...

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Progestins are classified according to their structure in C19 and C21 progestagens. The C19 ones are derived from testosterone, the C21 ones from progesterone. C21 progestagens include cyproterone acetate, dydrogesterone, medroxyprogesterone acetate, chlormadinone acetate, megestrol and promegestone. Of these, dydrogesterone is structurally most similar to progesterone. C19 progestagens include norethisterone, (levo)norgestrel, lynestrenol, desogestrel, norgestimate, gestodene and tibolone.

Different progestins have different combinations of androgen (testosterone-like) and progesterone activity. If the activity of 1 mg of norethindrone is taken as the baseline, 1 mg of the other progestins have activities as follows:


Norethindrone was synthetized for the first time in 1951 by the Mexican chemist Luis E. Miramontes. This substance became the basis for the contraceptive pill.

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FDA experts vote in favor of OTC sale of Plan B.(Across Specialties)(Food and Drug Administration)(over the counter) : An article from: Clinical Psychiatry News $5.95 Expect several months of spotting with levonorgestrel IUD. (Rapid Menstruation After Removal).(Brief Article) : An article from: Family Practice News $5.95
"Low dose mifepristone and two regimens of levonorgestrel for emergency contraception: A WHO multicentre randomized trial". (Other Notable Publications: ... An article from: Studies in Family Planning $5.95

Is single-dose levonorgestrel as effective as other emergency contraception regimens? - Patient Oriented Evidence That Matters: practice recommendations
von Hertzen H, Piaggio G, Ding J, et al. Low dose mifepristone and two regimens of levonorgestrel for emergency contraception: a WHO multicentre randomized ...
Ethinyl estradiol/levonorgestrel for oral contraception
Synopsis Ethinyl estradiol/levonorgestrel (Seasonale) is the first extended-cycle oral contraceptive. With Seasonale, women take active hormone for ...
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A contraceptive "pill pack" that contains two 0.75-mg tablets of levonorgestrel has been labeled by the U.S. Food and Drug Administration (FDA) for emergency contraception use. It is marketed under
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Open randomised study of use of levonorgestrel releasing intrauterine system as alternative to hysterectomy
Objectives: To assess whether the levonorgestrel intrauterine system could provide a conservative alternative to hysterectomy in the treatment of excessive ...
Update On Levonorgestrel For Emergency Contraception
To the Editor: As the authors of the Patient-Oriented Evidence that Matters (POEM) review "Combined Oral Contraceptives Versus Levonorgestrel for Emergency Contraception" (J Fam Pract 1998; 47:41
Risk of venous thromboembolism among users of third generation oral contraceptives compared with users of oral contraceptives with levonorgestrel before
Women who take third-generation oral contraceptives containing gestodene or desogestrel have about twice the risk of developing venous thromboembolism as women who use oral contraceptives containing l

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