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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.

Curevo is developing a shingles vaccine that Lilly believes could be as effective as the current standard but with reduced side effects, said Daniel Skovronsky, Lilly’s chief scientific and product officer.

From The Wall Street Journal • May 26, 2026

"Clinical trials generally identify the most dangerous side effects of drugs," says Ungar.

From Science Daily • May 24, 2026

They also noted that media attention surrounding Wegovy may have increased reporting of side effects, which could have influenced the results.

From Science Daily • May 23, 2026

The database contains reports of unintended and harmful side effects linked to medications.

From Science Daily • May 23, 2026

Whenever you read a cancer booklet or website or whatever, they always list depression among the side effects of cancer.

From "The Fault in Our Stars" by John Green