by Bill Roberts - Fluoxymesterone is a halogenated derivative of 17-alpha-methyltestosterone. Contrary to what one might expect, this drug has poor binding to the Androgen Receptor (AR). Presumably its effects are largely non-AR mediated. It however is a rather toxic drug and I consider it to be a poor choice except perhaps pre-contest for those willing to suffer its toxicity, or for endurance athletes in non-tested competitions.

Fluoxymesterone is the chemical name of active ingredient in Halotestin. Halotestin is a registered trademark of Pharmacia & Upjohn Company in the United States and/or other countries.

Halotestin Resources

Halotestin Pictures
Halotestin Prescribing Information

Substance name	Fluoxymesterone [INN]
Chemical name	9-fluoro-11ß,17ß-dihydroxy-17a-methylandost-4-en-3-one
Systematic name	(8S,9S,10S,11S,13S,14S,17S)-9-fluoro-11,17-dihydroxy-10,13,17-trimethyl-1,2,6,7,8,11,12,14,15,16-decahydrocyclopenta[a]phenanthren-3-one
Index name	Androst-4-en-3-one, 9-fluoro-11,17-dihydroxy-17-methyl-, (11beta,17beta)-
CAS number	76-43-7
Merck Index Number	Merck 11, 4113
Molecular formula	C20-H29-F-O3
Molecular weight	336.441 g/mol
Bioavailability	Oral: 100%
Metabolism	Hepatic
Elimination half-life	9.5 hours
Excretion	Urinary
Pregnancy category	X
Legal status	Prescription only (US); DEA Schedule III (US)
Routes of administration	Oral

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