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pep pill is a type of:

• drug of abuse, street drug (noun) - a drug that is taken for nonmedicinal reasons (usually for mind-altering effects)
• stimulant, stimulant drug, excitant (noun) - a drug that temporarily quickens some vital process

types of pep pill:

• Benzedrine, bennie (noun) - a form of amphetamine
• amphetamine sulfate, amphetamine sulphate (noun) - a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system
• dextroamphetamine sulphate, Dexedrine (noun) - an isomer of amphetamine (trade name Dexedrine) used as a central nervous system stimulant
• methamphetamine, methamphetamine hydrochloride, Methedrine, meth, deoxyephedrine, chalk, chicken feed, crank, glass, ice, shabu, trash (noun) - an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride