Fluoxymesterone is a synthetic androgen (a man-made male sex hormone) primarily used in men for testosterone replacement therapy. It is an orally active anabolic-androgenic steroid (AAS) and a derivative of testosterone.
✅ FDA-Approved Uses in Men
According to official prescribing information, fluoxymesterone is indicated for two main conditions in males:
●Hypogonadism: This is the primary use. It treats symptoms of low testosterone in adult men whose bodies do not produce enough of the hormone naturally due to certain medical conditions. The FDA label specifies it is for replacement therapy in cases of testosterone deficiency or absence, which can be caused by:
○Primary hypogonadism: Testicular failure due to issues like undescended testicles (cryptorchidism), testicular torsion, inflammation (orchitis), or surgical removal of the testicles (orchiectomy).
○Hypogonadotropic hypogonadism: A condition where the pituitary gland or hypothalamus fails to signal the testes to produce testosterone, often due to tumors, trauma, or radiation.
●Delayed Puberty: It is used to stimulate the onset of puberty in carefully selected adolescent males who have a clear and confirmed delay in sexual development.
Note: While fluoxymesterone is also used to treat breast cancer in women, this is a separate indication and not a use for men.
⚙️ How It Works
Fluoxymesterone works by binding to and activating the androgen receptor in the body, mimicking the effects of natural testosterone. This helps to develop and maintain male sexual characteristics and supports functions like protein building (anabolism) and red blood cell production.
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