Diuretics increase urine production and can make an athlete susceptible to dehydration. Diuretics are sometimes used by athletes to dilute their urine in an attempt to mask the use and avoid detection, of anabolic steroids. Analogues are substances that act in a similar way to hormones. Narcotic analgesics are strong painkillers and are usually only tested for in competition. A primary concern is that of athletes training or competing with an injury that requires regular and constant pain relief - perhaps the athlete would have a better result if the injury was treated with rest and an appropriate training program rather than with excessive drugs.
Narcotics are potentially addictive.
Blood doping Is the practise of removing blood a week or two prior to competition then replacing it just before the competition. Meanwhile the body has replaced the missing blood. The additional blood results in additional haemoglobin and therefore a greater ability for oxygen uptake. EPO is also a banned substance. These include examples such as an athlete injecting or placing, via a condom into their bladder or vagina, another person's urine to avoid a positive drug test.