Side effect (disambiguation)
A side effect is an effect that is secondary to the one intended.
Side effect or side effects may also refer to:

Computer science
Side effect (computer science), a state change caused by a function or expression

Medicine
Side effect (medicine), an unintended effect of the use of a drug

Media
Side Effects (Allen book), a 1986 collection of short stories by Woody Allen
Side Effects (TV series), a 1994 Canadian TV series
"Side Effects" (Ben 10 episode), a 2006 episode of television series Ben 10
Side Effects (Bass book), a 2008 nonfiction book by Alison Bass

Film
Side Effects (2005 film), starring Katherine Heigl
Side Effects (2013 film), directed by Steven Soderbergh
The Side Effect, a 2014 film directed by Ti West

Music
Band
Side Effect, a 1970s soul band
Side Effect (album), a 1975 album by R&B group Side Effect
The Side Effects, a 1980s indie rock band

Album
Side Effects (Dallas Smith album), 2016
"Side Effects" (Dallas Smith song)
The Side Effects (album), a 2019 album by Coldrain

Song
"Side Effects" (Mariah Carey song), 2008
"Side Effects" (Chainsmokers song), 2018
"Side Effects" a 2023 song by Becky Hill and Lewis Thompson

See also
Side product
Side reaction
By-product
Causality
Unintended consequences