An adverse drug reaction (abbreviated ADR) is an expression that describes harm associated with the use of given medications at a normal dosage during normal use. ADRs may occur following a single dose or prolonged administration of a drug or result from the combination of two or more drugs. The meaning of this expression differs from the meaning of "side effect", as this last expression might also imply that the effects can be beneficial. The study of ADRs is the concern of the field known as pharmacovigilance. An adverse drug event (abbreviated ADE) refers to any injury caused by the drug (at normal dosage and/or due to overdose) and any harm associated with the use of drug (e.g. discontinuation of drug therapy). ADRs are a special type of ADEs.
Read more about Adverse Drug Reaction: Mechanisms, Assessing Causality, Monitoring Bodies, Examples of Adverse Effects Associated With Specific Medications
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