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 promise is that the drugs could provide a new option for patients whose disease progresses after treatment with older drugs targeting the same mutations, and with more tolerable side effects.

From The Wall Street Journal • Jun. 10, 2026

He experienced side effects, including loss of libido, hot flushes, mood swings and fatigue.

From BBC • Jun. 9, 2026

Pfizer is hopeful that the experimental drug can lessen the side effects like nausea and diarrhea that occur with GLP-1s.

From MarketWatch • Jun. 6, 2026

Researchers say this approach improved blood sugar regulation and body composition in animal studies while avoiding several side effects often linked to GLP-1 therapies, including appetite suppression, muscle loss, and digestive issues.

From Science Daily • Jun. 3, 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