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
Consumers will be expected to answer 15 questions, covering topics such as their mood, general health, and any side effects from their current medication before receiving their prescription.
—
Will McCurdy, PC Magazine, 4 Apr. 2026
After battling a rare adrenal gland cancer for the past five years, Gilbert had experienced all sorts of side effects that can spring up from treatments and medications.
—Maya Georgi, Rolling Stone, 4 Apr. 2026
In more severe cases of hair loss, a doctor might prescribe oral minoxidil, which is generally absorbed better by the body but also typically comes with more side effects.
—Rebecca Strong, USA Today, 3 Apr. 2026
The Lancet published a study in February that should have closed the book on statin side effects.
—Vikas Patel, STAT, 3 Apr. 2026
See All Example Sentences for side effect
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Will McCurdy, PC Magazine, 4 Apr. 2026
After battling a rare adrenal gland cancer for the past five years, Gilbert had experienced all sorts of side effects that can spring up from treatments and medications.
—Maya Georgi, Rolling Stone, 4 Apr. 2026
In more severe cases of hair loss, a doctor might prescribe oral minoxidil, which is generally absorbed better by the body but also typically comes with more side effects.
—Rebecca Strong, USA Today, 3 Apr. 2026
The Lancet published a study in February that should have closed the book on statin side effects.
—Vikas Patel, STAT, 3 Apr. 2026
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 5 Apr. 2026.
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