![Stanozolol vial and needle](https://www.usada.org/wp-content/uploads/Stanozolol.png)
What is Stanozolol?
Stanozolol is a synthetic steroid derived from testosterone that has anabolic & androgenic properties, & classified as a Schedule III controlled substance.
![What do I do if I think someone in my sport is involved in doping?](https://www.usada.org/wp-content/uploads/Play-Clean-Tip-Center.jpg)
Be the Voice for the Right Choice
Be the voice for the right choice and and report activity that you believe is compromising a fair playing field to USADA’s Play Clean Tip Center.
![Design of a molecule.](https://www.usada.org/wp-content/uploads/large-molecule.png)
Science Spans Generations
USADA Chief Science Officer, Dr. Larry Bowers, & his son Dr. Geoff Bowers will both independently present at the American Chemical Society spring meeting.
![pills spilt out of open pill bottles](https://www.usada.org/wp-content/uploads/half-life-of-a-drug.jpg)
Half-Life of a Drug
Determining the half-life of a drug depends on many variables, and it is extremely important that athletes understand the clearance times of medications.
![Differences between direct and indirect markers of doping](https://www.usada.org/wp-content/uploads/dna_microscope.png)
Direct and Indirect Markers of Doping
There are different markers of doping used to identify the presence of a prohibited substance (or its metabolites) in the blood or urine of an athlete.
![How does USADA pick who to test?](https://www.usada.org/wp-content/uploads/testingquestion_web.jpg)
Selecting Athletes for Testing
Selecting Athletes for Testing USADA staff go to great lengths to develop an efficient and effective test distribution plan that allocates our resources intelligently. Factors for determining tests align with WADA’s International Standards for Testing and Investigations and may include: Physical demands of the sport and possible performance-enhancing effects that doping may elicit Doping analysis