Effect

Effect may refer to:

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

In 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
Dose-response effect, the relationship between a drug dose and its effect, plotted on a dose-response curve

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

Miscellaneous:

Effects, one's personal property or belongings
Effects (G.I. Joe), a fictional character in the G.I. Joe universe
Effects (film), a 2005 film
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

Amendments to the constitution of the United States: (Bill of Rights) Amendment IV "The right of the people to be secure in their persons, house, papers, and effects...

See also