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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.

It claimed to “factor in things like energy levels, treatment side effects, and time constraints—only when relevant.”

From Slate • May 6, 2026

These therapies can also be expensive and may trigger immune-related side effects, underscoring the urgent need for safer, more affordable options that can slow the disease.

From Science Daily • May 4, 2026

Countercompounds that soften harmful side effects of major drugs.

From The Wall Street Journal • May 4, 2026

Sally's story is among the hundreds the BBC has heard over the past year and a half, describing the devastating side effects of dopamine agonist drugs.

From BBC • May 1, 2026

Cancer kids are essentially side effects of the relentless mutation that made the diversity of life on earth possible.

From "The Fault in Our Stars" by John Green