Atenolol

The stewards at Prairie Meadows Monday disqualified the second-place finisher in the 2019 Iowa Derby. They ruled that a post-race positive test for the beta-blocker drug Atenolol was likely the result of "inadvertent exposure," yet because of mitigating factors that included the "extensive medication violation history" of trainer Steve Asmussen, the Hall-of-Fame conditioner would be fined $1,000. Atenolol slows the heart rate and decreases blood pressure when prescribed in humans for various cardiac ailments. The Association of Racing Commissioners International (ARCI) lists it as a Class 3, Penalty B substance...