The purpose of this was to determine the prevalence of using the anabolic androgenic steroid (AAS) included knowledge, attitude, frequency of session training a week, side-effect, level of education relative to the AAS.370 body builder who had exercise program at least once a week regularly over the two month period in Hamadan city, participated voluntarily in this study. 71 (19/2%) of 370 subjects had the AAS for median duration 7/18-month. The most frequent drugs were oxymetholone and Nandrolone Decanoate. The group users’ knowledge about AAS had significantly better information (t = 4.34; P<0.0001) compare to non users’ knowledge. This study indicated, although, 63.2  percent of subjects testified the AAS are dangerous, and 63 percent of group users experienced side-effect of the drug, but they intended to continue using AAS in the future. Since the wide use AAS by the youth, prevention health education and promotion program essential to prevent physical, mental, and social disorder associated to the AAS.