These are similar to the certain hormones (substances which are products of cells which has various stimulating effects on the body) like androgens, testosterone, dehydroepiandrosterone (DHEA) and androstenedione or andro etc of the body. Body produces steroids naturally to support such functions as fighting stress and promoting growth and development. But some people use steroid pills, gels, creams, or injections because they think steroids can improve their sports performance or the way they look. Its disadvantages are

• premature balding or hair loss
• dizziness
• mood swings, including anger, aggression, and depression
• seeing or hearing things that aren't there (hallucinations)
• extreme feelings of mistrust or fear (paranoia)
• problems sleeping
• nausea and vomiting
• trembling
• high blood pressure that can damage the heart or blood vessels over time
• aching joints
• greater chance of injuring muscles and tendons (fiberous tissue which connect muscle to the bone)
• jaundice or yellowing of the skin; liver damage
• urinary problems: pin in urination
• shortening of final adult height
• increased risk of developing heart disease, stroke, and some types of cancer
• testicular shrinkage
• impotence (inability to get an erection)
• sterility (inability to have children)

Because of health risks associated with them and their unproven performance benefits steroids are controversial in sports. Steroids can be addictive, making it hard to stop taking them. Steroid users can spend lots of time and money trying to get the drugs. People who use steroids also appear to be at higher risk for using other drugs.

Note : For full detail, visit the link : Are Steroids Worth the Risk?