I assume you are asking about anabolic steroids, they are used by some people to increase muscle mass, strength, and endurance. Athlete's of all levels have been known to take these substances with the hopes of getting bigger and stronger. The goal is to improve muscular performance thereby improving competitiveness and winning more games, matches, etc.
One potential life threatening side affect of these substances is hyperglycemia(high blood sugar). When the blood sugar rises to extreme levels all sorts of sequelae may follow such as confusion, delirium, intense anger and rage, and coma.
Alcohol is a central nervous system depressant which alters mood, mentation and physical performance. Long term effects may include liver damage and liver failure which can result in death.
If you are consuming these substances, you are damaging your health.