Methyltestosterone

Methyltestosterone (brand names Android, Androral, Metandren, Oraviron, Testred, Virilon), also known as 17α-methyltestosterone or as 17α-methylandrost-4-en-17β-ol-3-one, is a synthetic, orally active androgenic-anabolic steroid (AAS) and 17α-methylated derivative of testosterone that is used to treat males with androgen deficiency. It bears close structural similarity to testosterone, but has a methyl group at the C17α position in order to increase oral bioavailability. Due to efficient aromatization into the potent estrogen methylestradiol, methyltestosterone has relatively high estrogenicity and hence potential side effects such as gynecomastia.