Meaning of the word "adverse effect" in English

What does "adverse effect" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

adverse effect

US /ædˈvɜrs ɪˈfɛkt/
UK /ædˈvɜːs ɪˈfɛkt/

Noun

an undesirable or harmful effect caused by something, such as a drug or medical treatment

Example:
The new medication has several potential adverse effects.
We need to monitor patients for any adverse effects after the surgery.