April 4th, 2009
Understanding Adverse Drug Reactions
An adverse drug reaction (ADR) is any unintended, noxious or undesired effect that occurs when a drug is used at accepted doses for preventing, diagnosing or treating a condition.
By this definition from the World Health Organization, ADRs can be further categorized into those that are related to the known mechanisms of the drug (although some may not be) or those that are related to reactions with the immune system.