Table 2.

Product characteristics of drugs and their packaging with impact on administration errors or adherence

Characteristic	Described effect	Description/Example	References
Similar drug names	Administration error	Administration of wrong drug	[33]
Similar drug appearance	Administration error	Administration of wrong drug	[34, 35]
Patient-unfriendly nature of solid oral dosage forms	Administration error	Inappropriate modification of dosage form due to form of tablets or surface material	[25]
Patient-unfriendly nature of liquid oral dosage forms	Administration error	Dosing error due to viscosity or modified administration due to unpleasant flavor	[36, 37]
Product characteristics associated with nonadherence
Intricate packaging [37, 38]