To enhance one's performance by using some drug. Use of banned enhancing drugs in sports is s know as doping.

The reasons for ban are health risks of performance enhancing drugs. The equality of opportunity for athletes and doping free sports for public.

Lance Armstrong an iconic cyclist was banned for lifetime from competitions. Because he was charged by United States Anti-Doping Agency in June 2012.

World Anti-Doping Agency  WADA is an independent foundation created by initiative led by International  Olympic committee IOC in Nov 10 1999.

WADA is responsible for the a world Anti-doping Code.

Adopted by more than 600 sports organizations.