Slideshows Images Quizzes

Definition of Adverse reaction

Adverse reaction: In pharmacology, any unexpected or dangerous reaction to a drug. An unwanted effect caused by the administration of a drug. The onset of the adverse reaction may be sudden or develop over time.

Also called an adverse drug event (ADE), adverse drug reaction (ADR), adverse effect or adverse event.

Reviewed on 5/13/2016

Health Solutions From Our Sponsors