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:

• Side effect (computer science), a state change caused by a function or expression
• Side effect (medicine), an unintended effect of the use of a drug

• 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

• 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
• Side Effects, an Indian romcom film series, including
• Pyaar Ke Side Effects (2006)
• Shaadi Ke Side Effects (2014)

• Side Effect (band), a 1972–1982 American disco and jazz-funk band
• The Side Effects (band), a 1980–1982 American indie rock band

• Side Effect (album), by Side Effect, 1975
• Side Effects (Dallas Smith album) or the title song (see below), 2016
• The Side Effects (album), by Coldrain, or the title song, 2019
• Side Effects (EP), by Mads Langer and Tim Christensen, or the title song, 2014
• Side Effects, by White Denim, 2019

• "Side Effects" (The Chainsmokers song), 2018
• "Side Effects" (Dallas Smith song), 2016
• "Side Effects" (Mariah Carey song), 2008
• "Side Effects", by Becky Hill from Believe Me Now?, 2024
• "Side Effects", by Carlie Hanson, 2019
• "Side Effects", by Mimi Webb from Confessions, 2025
• "Side Effects", by Stray Kids from , 2019
• "Side Effects", by Ty Dolla Sign from Beach House 3, 2017

• Side product
• Side reaction
• By-product
• Causality
• Unintended consequences