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

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.

This medication is a male hormone used to treat delayed male puberty or to treat a testosterone/androgen deficiency. In women, this medication is used to treat breast cancer.

Halotestin is basically known for increasing aggression and strength, and for being liver toxic. Recommended dosage of Halotestin at or under 10 - 40mgs/day.