"Normal" is the best there is. Drugs of any type should only be used in disease, deficiency, or injury states. Any other use of drugs is only a form of internal pollution, and there is no valid evidence that any drug ever improved any athlete's performance. The real difficulty is that many drugs make people feel they are better, but it is an illusion. This myth is perpetuated by the limited testing occasionally done on only the winners. When all of the contestants have been tested, it has been found that more of the losers dabble in the drug area.
Cooper DL. Drugs and the Athlete. JAMA. 1972;221(9):1007–1011. doi:10.1001/jama.1972.03200220041010