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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.

The most common adverse side effects were mostly “low-grade” rash, diarrhea, fatigue, and infusion reaction.

From Barron's • May 11, 2026

But broadly speaking, the combination regimen is preferred, as it can help hasten the process and curb uncomfortable side effects including cramping and bleeding.

From Barron's • May 10, 2026

Once a patient is on a drug, side effects are often addressed with a second drug rather than with a reassessment of the first.

From The Wall Street Journal • May 10, 2026

His recovery was smooth, with minimal side effects.

From Science Daily • May 6, 2026

The unintentional side effects of wind or wave or current.

From "Internment" by Samira Ahmed