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:

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*Plan B(R) One-Step (Levonorgestrel) http://4in.fo/E8tE2g
zac_nicholson (Zac Nicholson) Fri, 30 Oct 2009 17:16:49 -0000
*Plan B(R) One-Step (Levonorgestrel) http://4in.fo/E8tE2g
@cciurlizza Imagínate cómo googlearán los católicos "Etinilestradiol" y "levonorgestrel" para entender de qué hablamos
apuntesperuanos (Apuntes Peruanos) Thu, 29 Oct 2009 17:57:09 -0000
@cciurlizza Imagínate cómo googlearán los católicos "Etinilestradiol" y "levonorgestrel" para entender de qué hablamos
aprendi a falar uma palavra nova: LEVONORGESTREL!
camilavivi_ (Camila ViVi) Wed, 28 Oct 2009 19:50:26 -0000
aprendi a falar uma palavra nova: LEVONORGESTREL!
Nadie en la ciencia ha encontrado UN SOLO CASO en que el levonorgestrel produzca microaborto. La "duda razonable" de razon no tiene nada
suberca10 (Arturo Subercaseaux) Wed, 28 Oct 2009 13:49:11 -0000
Nadie en la ciencia ha encontrado UN SOLO CASO en que el levonorgestrel produzca microaborto. La "duda razonable" de razon no tiene nada
Levonorgestrel Tablets
solitairepharma (Solitaire Pharmacia ) Wed, 28 Oct 2009 10:55:46 -0000
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