Steroids are drugs that mimic certain hormones in the human body. Steroids can change how the body works and develops. There are two types of steroids—anabolic and corticosteroids. Anabolic steroids are commonly misused by those wanting to build muscle mass and should not be confused with corticosteroids used medically for conditions such as asthma. Anabolic steroids are synthetic drugs with some of the same effects as the male hormone testosterone, they can come in tablet, capsule or liquid form. They can increase endurance and performance and can stimulate muscle growth. In Ireland, steroids are prescription-only drugs. Purchasing steroids without a prescription is illegal. Anabolic steroids are addictive and users can experience with-drawl.