Table 1

Definition and classification of drug related problems (DRPs) based on the two most used systems

DRP: Cipolle et al9	DRP: PCNE11
An undesired patient experience that involves drug therapy and that actually or potentially interferes with the desired patient outcome	An event or circumstance involving drug therapy that actually or potentially interferes with desired health outcomes
▸ Need for additional therapy ▸ Unnecessary drug therapy ▸ Wrong drug ▸ Dosage too low ▸ Adverse drug reaction ▸ Dosage too high ▸ Non-compliance	▸ Problems – Treatment effectiveness – Adverse reactions – Treatment costs – Other ▸ Causes – Drug selection – Drug form – Dose selection – Treatment duration – Drug use/administration – Logistics – Patient – Other