Adverse drug reactions
An adverse drug reaction is an unintended harmful response associated with appropriate drug use. Causality is assessed from chronology, known pharmacology and competing explanations.
Open interactive lesson & self-check ↗Adverse drug reactions — learning map
Original conceptual SVG · scalableOriginal schematic relationship map for this topic; relationships are organized for study, not intended as an anatomical depiction or a diagnostic algorithm.
Type A reactions
Augmented reactions tend to relate to known pharmacologic effects and exposure; examples include excessive anticoagulant effect under some circumstances.
Type B reactions
Some immunologic and idiosyncratic reactions are not simply extensions of the expected pharmacological effect.
Interaction and patient factors
Kidney or liver impairment, genetics, age, pregnancy and concurrent medicines may change exposure or sensitivity.
Pharmacovigilance
Clinicians document suspected events and report them using appropriate institutional or regulatory systems, allowing aggregated safety signals to be evaluated.
Reference and next reading
Explore the original curriculum and publisher-hosted resources for full-depth reading; this note is an original schematic introduction, not an exhaustive chapter.