(AAS) This class of drugs is generally used to enhance muscle mass, performance, endurance and recovery time between workouts. They are a synthetic form of the male hormone testosterone. There are certain steroids which are used for medical purposes. AAS is a schedule III controlled substance that requires a prescription. Abuse of AAS can lead to severe health conditions such as myocardial infarction, liver problems, bone loss, changes in libido, sterility, and aggression, to name a few.