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The reasons for the ban are mainly the health risks of performance-enhancing drugs, the equality of opportunity for athletes, and the exemplary effect of drug-free sport for the public. Anti-doping authorities state that using performance-enhancing drugs goes against the spirit of sport.
Diuretics, which promote the production of urine and are used to help high blood pressure, are banned because they can be used by athletes to hide other performance-enhancing substances.