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Table 1 Classification of adverse drug reactions [1, 4, 5]

From: Drug allergy

Type A: Predictable Type B: Unpredictable
• Drug overdose
• Secondary drug effects
• Side effects
• Drug interactions
• Drug allergy: an immunologically mediated ADR
• Pseudoallergic (non-allergic): a reaction with the same clinical manifestations as an allergic reaction, but that lacks immunological specificity
• Drug intolerance: an undesirable pharmacologic effect that occurs at low and sometimes sub-therapeutic doses of the drug that are not caused by underlying abnormalities of metabolism or drug excretion
• Drug idiosyncrasy: an abnormal/unexpected effect, usually caused by underlying abnormalities of metabolism, excretion, or bioavailability
  1. ADR: adverse drug reaction