side effect
noun
: a secondary and usually adverse effect (as of a drug)
toxic side effects
called also side reaction
Examples of side effect in a Sentence
Nausea and diarrhea are the side effects of the drug.
the harmful side effects of using chemicals to kill insects
The merger created positive side effects for both companies.
Recent Examples on the Web
Nausea While mild, nausea is another potential side effect of taking melatonin supplements.
—
Jennifer Lefton, Verywell Health, 23 May 2025
Over the past few weeks, TikTok users have sparked a heated conversation over a potential side effect of Dior Addict Lip Glow Oil.
—Jasmine Browley, Allure, 22 May 2025
And the drug can also bring unpleasant side effects like belly pain, nausea, diarrhea, and low-grade fever.
—Erica Sloan, SELF, 21 May 2025
Other cases may stem from hormone changes, infections, medication side effects, substance use, or underlying health conditions.1
Hormonal Changes
Hormonal shifts, like those that happen during your period, pregnancy, or menopause, can leave you feeling run down.
—Brandi Jones, Health, 20 May 2025
See All Example Sentences for side effect
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Jennifer Lefton, Verywell Health, 23 May 2025
Over the past few weeks, TikTok users have sparked a heated conversation over a potential side effect of Dior Addict Lip Glow Oil.
—Jasmine Browley, Allure, 22 May 2025
And the drug can also bring unpleasant side effects like belly pain, nausea, diarrhea, and low-grade fever.
—Erica Sloan, SELF, 21 May 2025
Other cases may stem from hormone changes, infections, medication side effects, substance use, or underlying health conditions.1
Hormonal Changes
Hormonal shifts, like those that happen during your period, pregnancy, or menopause, can leave you feeling run down.
—Brandi Jones, Health, 20 May 2025
See All Example Sentences for side effect
Cite this Entry
“Side effect.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/side%20effect. Accessed 29 May. 2025.
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