Skip to Main Content

SA Pharmacy Medicines Information Service

Drug Interactions


PATIENT FACTORS – age, medical conditions, risk of the interaction outcome to patient 

PHARMACOKINETICS – absorption, how the drug is metabolised by liver or excreted by kidneys, enzymes/kidneys transporters inhibited or induced

PHARMACODYNAMICS –  mechanism of action, receptors agonised/antagonised, similar side effects which may be additive

TIME FACTORS – time for interaction to develop and resolve. Enzyme inhibition is generally rapid (2-3 days), whereas enzyme induction is generally slower (2 - 3 weeks) 

General Resources


Specialised Resources



Need help with these resources or your question? Contact Medicines Information


Something not working - report a problem with access.