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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

Nearly 4% of users who reported side effects also described reproductive symptoms, including irregular menstrual cycles, intermenstrual bleeding, and heavy bleeding.

From Science Daily • May 24, 2026

The team hopes the findings encourage scientists and healthcare providers to pay closer attention to the kinds of side effects patients are discussing online.

From Science Daily • May 24, 2026

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

From Science Daily • May 23, 2026

Though radium often causes relentless nausea, vomiting, weakness, and anemia, there’s no record of Henrietta having any side effects, and no one remembers her complaining of feeling sick.

From "The Immortal Life of Henrietta Lacks" by Rebecca Skloot