/ Thesaurus / P Synonyms of pep pill Find synonyms for: Noun1. amphetamine, pep pill, upper, speed, stimulant, stimulant drug, excitant, drug of abuse, street drugusage: a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depressionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: respite Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language