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methandrostenolone : ウィキペディア英語版
methandrostenolone

Methandrostenolone (trade names Averbol, Dianabol, Danabol), also known as metandienone (INN), methandienone, or informally as dianabol, is an orally-effective anabolic steroid originally developed in Germany and released in the US in the early 1960s by Ciba Specialty Chemicals. Methandrostenolone is a controlled substance in the United States and Western Europe and remains popular among bodybuilders. An injectable form is sold online from United States-based companies. Methandrostenolone is readily available without a prescription in countries such as Mexico (under the trade name Reforvit-b), and is also being manufactured in Asia and many East European countries.
==Biophysiology==

Methandrostenolone binds tightly to the androgen receptor in order to exert its effects. These include dramatic increases in protein synthesis, glycogenolysis, and muscle strength over a short space of time. Side effects such as gynecomastia, high blood pressure, acne and male pattern baldness may begin to occur. The drug causes severe masculinising effects in women even at low doses. In addition, it is metabolized into methylestradiol by aromatase. This means that without the administration of aromatase inhibitors such as anastrozole or aminoglutethimide, estrogenic effects will appear over time in men. Many users will combat the estrogenic side effects with Arimidex, Nolvadex or Clomid. In addition, as with other 17α-alkylated steroids, the use of methandrostenolone over extended periods of time can result in liver damage without appropriate care.
The 17α-methylation of the steroid does allow it to pass through the liver with only a small portion of it broken down (hence causing the aforementioned damage to the liver) allowing it to be effective when taken orally. It also has the effect of decreasing the steroid's affinity for sex hormone binding globulin, a protein that de-activates steroid molecules and prevents them from further reactions with the body. As a result, methandrostenolone is significantly more active than an equivalent quantity of testosterone, resulting in rapid growth of muscle tissue. However, the concomitant elevation in estrogen levels - a result of the aromatization of methandrostenolone - results in significant water retention. This gives the appearance of bad gains in mass and strength, which prove to be temporary once the steroid is discontinued and water weight drops. Because of this, it is often used by bodybuilders only at the start of a "steroid cycle", to facilitate rapid strength increases and the appearance of great size, while compounds such as testosterone cypionate or testosterone enanthate with long acting esters build up in the body to an appreciable amount capable of supporting anabolic function on their own.

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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