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side effects

NOUN

adverse or unwanted secondary effect

Synonyms

STRONGEST

aftereffect reaction

WEAK

aftermath aftertaste byproduct carryover concomitant corollary leftover offshoot secondary response side issue sidebar spinoff

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

However, patients taking daraxonrasib were far less likely to stop treatment due to severe side effects compared to chemotherapy, and they had improved quality of life with reduced pain.

From Science Daily • Jun. 4, 2026

One of the hardest parts of cancer is how little control you have over any of it - the diagnosis, treatment, or the side effects.

From BBC • Jun. 3, 2026

In Phase 2 trials reported last year, amyloid quickly fell to low levels, while swelling and bleeding side effects were rare.

From Barron's • Jun. 3, 2026

Researchers said the treatment also avoided some side effects seen with other drugs targeting liver fat production, including dangerous increases in triglycerides.

From Science Daily • May 27, 2026

The entomologist, whose specialty is insects, is not so qualified by training, and is not psychologically disposed to look for undesirable side effects of his control program.

From "Silent Spring" by Rachel Carson