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Systematic (IUPAC) name
Clinical data
AHFS/ International Drug Names
Pregnancy cat.
Legal status
Routes Oral
Pharmacokinetic data
Bioavailability 99% oral
Protein binding yes
Metabolism Hepatic
Half-life ?
Excretion Renal
CAS number 521-11-9 N
ATC code None
PubChem CID 10633
ChemSpider 10187 YesY
UNII S712YZ168E YesY
KEGG D01533 YesY
Synonyms (5S,8R,9S,10S,13S,14S,17S)-17-hydroxy-10,13,17-trimethyl-2,4,5,6,7,8,9,11,12,14,15,16-dodecahydro-1H-cyclopenta[a]phenanthren-3-one
Chemical data
Formula C20H32O2 
Mol. mass 304.467 g/mol
 N (what is this?)  (verify)

Mestanolone is the 17α-methylated version of dihydrotestosterone (DHT).[1] The systematic name of mestanolone is: 17β-hydroxy-17α-methylandrost-3-one.[2] It is an orally bioavailable androgenic steroid that is highly androgenic while only slightly anabolic. It is incapable of aromatization and is not an agonist of the progesterone receptor.

Dosage Information

Dosages range from 10 mg to 30 mg a day for males. Women should avoid Mestanolone for it is very androgenic. Long term use, more than 12 weeks should be avoided do to hepatoxicity. Since Mestanolone is unable to convert to estrogen, it is very useful during cutting phases or when one wishes to avoid excess weight gain.


  1. ^ CTD (2007). "Chemicals: mestanolone". CTD - Comparative Toxicogenomics Database. Retrieved September 3, 2007. 
  2. ^ Biology (2007). "mestanolone". Biology Retrieved September 3, 2007.