The Collaborative International Dictionary of English v.0.48:

Dexedrine \Dexedrine\ n.
   an isomer of amphetamine used as a central nervous system
   stimulant (Dexedrine is a trademark).

   Syn: dextroamphetamine sulphate.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Dexedrine
    n 1: an isomer of amphetamine (trade name Dexedrine) used as a
         central nervous system stimulant [syn: dextroamphetamine
         sulphate, Dexedrine]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "Dexedrine":
   Benzedrine, Benzedrine pill, C, Dexamyl, Dexamyl pill,
   Dexedrine pill, Methedrine, amphetamine, amphetamine sulfate,
   cocaine, coke, crystal, dextroamphetamine sulfate, football, heart,
   jolly bean, methamphetamine hydrochloride, pep pill, purple heart,
   snow, speed, stimulant, upper