DXM is also used recreationally. When exceeding label-specified maximum dosages, dextromethorphan acts as a dissociative anesthetic. Its mechanism of action is via multiple effects, including actions as a nonselective serotonin reuptake inhibitor and a sigma-1 receptor agonist.
Aroldis Chapman has thrown the fastest pitch ever recorded, but he has challengers for baseball's hottest heater in 2017. Ever since Aroldis Chapman delivered a 105 mph fastball to Tony Gwynn Jr., Chapman's name has been synonymous with velocity.
It is uncertain what the fastest pitcher ever thrown has been, but there have been many claims. One of these claims was a made by a journalist for Sports Illustrated, George Plimpton in 1985. He said that a man going by the name of Sidd Finch had thrown a 168 mph (75.1 m/s) fastball.