Black Beauty [Mr. Siegal ] 1. Street name for amphetamine. Amphetamine, dextroamphetamine, and methamphetamine are collectively referred to as amphetamines. Their chemical properties and actions are so similar that even experienced users have difficulty knowing which drug they have taken. The effects of amphetamines, especially methamphetamine, are similar to cocaine, but their onset is slower and their duration is longer (Drug Free Workplace, Daniel C. Drew, M.D. ). 2. Biphetamine. This is really a kind of amphetimine, as is dexedrine. Black Beauty is the street name for biphetamine because the pharmaceutical drug came in a black capsule (Submitted by Richard Beckwith, Raindogs Listserv Discussionlist. August, 2000 )