Effect

Effect may refer to:


 * A result or change of something
 * List of effects
 * Cause and effect, an idiom describing causality

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