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Oxandrolone
Oxandrolone, also known as oxandrin, is a drug first synthesized by Raphael Pappo while at Searle Laboratories, now Pfizer Inc., under the trademark Anavar, and introduced into the United States in 1964. It is a synthetic anabolic steroid derivative of dihydrotestosterone with an oxygen atom replacing the 2 carbon and methylation in the 17 position.
==Biological effects==
Oxandrolone is widely used due to its exceptionally small level of androgenicity accompanied by moderate anabolic effect. Although oxandrolone is a 17-alpha alkyloid, its liver toxicity is very small as well. Studies have shown that a daily dose of 20 mg oxandrolone used in the course of 12 weeks had only a negligible impact on the increase of liver enzymes. As a DHT derivative, oxandrolone does not aromatize, and thus does not cause gynecomastia. It also does not significantly influence the body's normal testosterone production (HPTA axis) at low dosages (20 mg). When dosages are high, the human body reacts by reducing the production of luteinizing hormone after perceiving endogenous testosterone production as too high; this in turn eliminates further stimulation of Leydig cells in the testicles, causing testicular atrophy.
In a randomized, double-blind study, patients with 40% total body surface area burns were selected to receive standard burn care plus oxandrolone, or without oxandrolone. Those treated with oxandrolone showed improved body composition, preserved muscle mass and reduced hospital stay time.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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