From WSJ: Doctors often prescribe tamoxifen to breast cancer patients to keep their tumors from growing. But the drug is also used by doping athletes looking to get ahead of the competition. How does it give them an edge, biologically? Watch the video below:



Earlier this year, British cyclist Simon Yates was caught up in a doping controversy related to terbutaline, a common asthma medication. Athletes can take the inhaled version if they get a doctor's note. But current testing methods can't differentiate between this and other banned versions. Watch the video below:



Related:

The Science of Doping: How Testosterone-Boosting Drugs Work http://buff.ly/2bYWulU