Disgraced sprinter Ben Johnson was stripped of his gold medal in the 100m at the 1988 Seoul Olympics after he tested positive for the steroid Stanozolol.
The drug is derived from the potent male sex hormone dihydrotestosterone, also known as DHT.
Stanozolol is a synthetic anabolic steroid commonly used as a performance-enhancing drug in sports.
The drug, which is milky white in colour, is commonly sold in tablet form under the name Winstrol, and is also available as an injectable medicine under the name Winstrol Depot.
It was developed in 1962 and has been approved by US drug regulators at the Food and Drug Administration (FDA) for use in humans, where it can be used to treat anaemia and angioedema which causes episodes of swelling of the face, extremities, genitals, bowel and throat.
Vets treating animals may prescribe the drug to improve muscle growth, red blood cell production, increase bone density and stimulate the appetite.
It is banned from use in national international sports competition under World Anti Doping Agency (Wada) rules.
Anabolic steroid abuse leads to serious health problems, such as kidney problems or failure, liver damage, enlarged heart, high blood pressure, changes in blood cholesterol, and all increase the risk of stroke and heart attack.