by Halotestin (fluoxymesterone) is a halogenated derivative of 17-alpha-methyltestosterone. Contrary to what one might expect, Halotestin has poor binding to the Androgen Receptor (AR). Presumably the effects of fluoxymesterone are largely non-AR mediated. Halotestin, 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.