Effect may refer to: A result or change of something List of effects Cause and effect, an idiom describing causality Look up effect in Wiktionary, the free dictionary. Pharmacy and pharmacology Drug effect, a change resulting from the administration of a drug Therapeutic effect, a beneficial change in medical condition, often caused by a drug Adverse effect or side effect, an unwanted change in medical condition caused by a drug In media Special effect, an artificial illusion Sound effect, an artificially created or enhanced sound Visual effects, artificially created or enhanced images Audio signal processing Effects unit, a device used to manipulate electronic sound Effects pedal, a small device attached to an instrument to modify its sound Other uses Effects, one's personal property or belongings Effects (G.I. Joe), a fictional character in the G.I. Joe universe Effects (film), a 1979 film (give a wide release in 2005) Effect size, a measure of the strength of a relationship between two variables Effect system, formal system which describes the computational effects of computer programs Pro-Design Effect, an Austrian paraglider design manufactured by Pro-Design See also All pages with titles beginning with Effect All pages with titles containing Effect Affect (disambiguation) Effectiveness Efficacy Pragmatism, the philosophy of causes and effects This disambiguation page lists articles associated with the title Effect.If an internal link led you here, you may wish to change the link to point directly to the intended article. Wikiwand - on Seamless Wikipedia browsing. On steroids.