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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

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

From The Wall Street Journal • May 1, 2026

There's endless appointments, all sorts of side effects from having your body "nuked like Chernobyl", fatigue from having to constantly advocate for yourself, and massive financial pressure - despite subsidies from Australia's universal healthcare system.

From BBC • May 1, 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