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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.

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

The company said no one in the study suffered serious side effects from the medication.

From The Wall Street Journal • May 1, 2026

So when her doctor prescribed a drug, which immediately relieved her symptoms without any mention of psychiatric side effects, she was euphoric.

From BBC • May 1, 2026

After months of online research, which included wading through warnings about finasteride’s side effects, he started on a quarter dose of the drug at 19.

From The Wall Street Journal • May 1, 2026

“Not your fault, Hazel Grace. We’re all just side effects, right?”

From "The Fault in Our Stars" by John Green