In sports, using illegal substances or techniques to improve performance is becoming very prevalent, which frequently kills the spirit of competition. The use of performance-enhancing drugs by athletes was reported to occur at rates varying from 5% to 31% by the regulatory organisations for sports. With the use of such drugs, athletes run the risk of suffering severe injuries and morbidities, which can result in poor health. Anabolic-androgenic steroids and their analogues, blood, erythropoietin, growth hormone and its derivatives, nutritional supplements, creatine, amphetamines, beta-hydroxy-beta-methyl butyrate (HMB), stimulants, and analgesics are some of the substances that are frequently misused in sports. Studying the different facets of drug use and abuse in sports, as well as providing medical care for sports-related injuries, are all included in sports pharmacology.