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A progestin is a synthetic progestagen. These particular synthetic hormones are most often used in the production of contraceptives.
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:
More on [ Progestin ]
Loestrin Fe 1/20: norethindrone acetate 1 mg + ethinyl estradiol 20 mcg with 7 tablets of ferrous fumarate 75 m.. http://bit.ly/5FFhSB
DrugGuide (Davis's Drug Guide) Tue, 29 Dec 2009 01:52:25 -0000
Loestrin Fe 1/20: norethindrone acetate 1 mg + ethinyl estradiol 20 mcg with 7 tablets of ferrous fumarate 75 m.. http://bit.ly/5FFhSB
MedlinePlus: Norethindrone - Features information about dosage, usage, warnings, and side effects.
Meta Description: [ Norethindrone ]
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