Side effect antonyms

What is the opposite word for Side effect?

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Antonyms for Side effect. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/antonyms/side_effect
Antonyms for Side effect. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/antonyms/side_effect>.
Antonyms for Side effect. 2016. Accessed August 10, 2026. https://thesaurus.plus/antonyms/side_effect.