Doping in sports - condition training is prohibited, and is against sports ethics. In sports vocabulary, doping is a fraud, and an insult to honest and hardworking athletes and sports competitors, who "shed" blood, tears and sweat in order to achieve enviable sports successes in an honest way. It is used by athletes of various sports and sports disciplines, during competitions, but also in fitness preparation itself. The use of substances to enhance one's abilities is as old as mankind itself. That is why the beginnings of doping go back a long way in history, so it was taken by individuals even outside of sports, such as soldiers in military battles who chewed "coca" leaves in order to be more durable and not to feel the fear of opponents and death. As for the name "doping" itself, it is assumed to come from the Dutch word "doop", meaning opium drink. The problem of doping is truly a big problem, which affects the very development of sports and changes the image of sports, but also negatively affects the health of the athletes themselves. This negative influence of doping also spreads to other spheres of society, so more and more recreational athletes use doping substances in gyms around the world, including in our country and in our cities. Because of this, the issue of doping becomes a psychological and sociological as well as a health issue of crucial importance for the collective state of the society in which we find ourselves. This paper deals with the described issue and will define what doping is, and show how the image of doping has changed throughout history. Also, the paper will cover the ethical principles of doping, show the ways of using and detecting the same, and go through the list of illegal substances. Today, there are competent authorities and organizations that prescribe strict rules on doping and doping control, which contributes to the prevention of such unacceptable behavior in sports.