10 Things You Should Know About Speed drug Speed drug also known by the names; upper, phet, billy, whiz, sulph, base, dexedrine, or dexamphetamine is a white, odorless, bitter-tasting central nervous system stimulant, chemically related to amphetamine, but with greater central nervous system effect which begins within 20 minutes and lasts for 4-6 hours. Amphetamines […]