side effect

Từ điển Oxford Advanced Learner 8th

ˈside effect [side effect side effects] BrE NAmE noun usually plural
1. an extra and usually bad effect that a drug has on you, as well as curing illness or pain
•The drug has few side effects.
•Side effects include skin rashes and nausea.
2. an unexpected result of a situation or course of action that happens as well as the result you were aiming for
•Opponents of the policy fear that it could have unfortunate side effects on the economy.

Example Bank:
•The medication can have adverse side effects on the patient.
•The patient suffered severe side effects from the drug.
•The treatment has some unfortunate side effects.
•This drug has no known side effects.