Abstact 

Many cases of anabolic steroid abuse are reported nowadays. Anabolic androgenic steroids are used to enhance athletic performance and appearance. Not only athletes take anabols but also young people who practice fitness and want to look like a bodybuilder. Anabolic steroid abuse can be associated with a wide range of adverse side effects ranging from some that are physically unattractive, such as acne and breast development in men, to others that are life threatening, such as heart attacks and liver cancer. Most are reversible if the abuser stops taking the drugs, but some are permanent, such as voice deepening in females. Most data on the long-term effects of anabolic steroids in humans come from case reports rather than formal epidemiological studies. Steroid abuse disrupts the normal production of hormones in the body, causing both reversible and irreversible changes. Changes that can be reversed include reduced sperm production and shrinking of the testicles (testicular atrophy). Irreversible changes include male-pattern baldness and breast development (gynecomastia) in men. In one study of male bodybuilders, more than half had testicular atrophy and/or gynecomastia.In this study we make review of the most important side effects of use of steroids.