Why: It blocks the hormones that cause male pattern baldness but won't make you any faster.
Substance: Sildenafil citrate
Why: Faster, stronger, longer—yes. But the performance boost doesn't transfer to sports.
Why: Studies have shown a marginal benefit in non-asthma sufferers.
Why: It's not considered a performance enhancer, but it could still land you a three-month suspension.
Why: Pop enough of it and you're basically racing on speed.
Why: This powerful anti-inflammatory can quell a rogue rash and make you feel like Superman on the course.
*For more information from the U.S. Anti-Doping Agency about each of these drugs, go to globaldro.com.