TABLE 11.

Classification of potentially preventable DRAs related to treatment effectiveness (N = 50).

Categories of preventable DRAs related to treatment effectiveness	No.	Medication classes involved
UNDERUSE
Omission of the indicated drug	8	Antithrombotic agents (2), Antithrombotic agents + Lipid modifying agents (2), Agents acting on the renin-angiotensin system (1), Antianemic preparations (1), Thyroid therapy (1), Diuretics + Agents acting on the renin-angiotensin system (1)
The duration of therapy is too short	1	Antithrombotic agents (1)
Adherence concerns	35	Diuretics (7), Drugs used in diabetes (6), Agents acting on the renin-angiotensin system (4), Antibacterials for systemic use (3), Antithrombotic agents (3), Antianemic preparations (2), Immunosuppressants (2), Antithrombotic agents + Lipid modifying agents (1), Calcium channel blockers + Antithrombotic agents (1), Calcium channel blockers + Beta blocking agents + Diuretics + Lipid modifying agents (1), Diuretics + Agents acting on the renin-angiotensin system + Antithrombotic agents + Lipid modifying agents (1), Diuretics + Beta blocking agents (1), Intestinal antiinflammatory agents (1), Psychoanaleptics (1), Psycholeptics (1)
MISUSE
Inappropriate monitoring	5	Drugs used in diabetes (2), Diuretics (2), Antithrombotic agents (1)
Inappropriate discontinuation or dose decrease	1	Diuretics + Beta blocking agents (1)

DRA, Drug-related hospital admission.