Table 3

Frequency of adverse drug events and medication errors according to each drug class

Drug classADEs, n (%) (n=1207)All MEs, n (%) (n=600)Preventable ADEs, n (%) (n=437)Potential ADEs, n (%) (n=147)MEs without risk of injury, n (%) (n=16)
Psychotropic drugs 688 (57.0) 320 (53.3) 293 (67.1) 26 (17.7) 1 (6.2)
Sedatives (BZDRA)189 (15.7)141 (23.5)137 (31.4)4 (2.7)0 (0)
Antipsychotics (atypical)189 (15.7)55 (9.2)47 (10.8)8 (5.4)0 (0.0)
Mood stabilisers101 (8.4)40 (6.7)37 (8.5)3 (2.0)0 (0.0)
Antipsychotics (typical)53 (4.4)9 (1.5)8 (1.8)1 (0.7)0 (0.0)
Antidementia medicines50 (4.1)20 (3.3)20 (4.6)0 (0.0)0 (0.0)
Anti-parkinsonian drugs41 (3.4)35 (5.8)25 (5.7)9 (6.1)1 (6.3)
Anxiolytics34 (2.8)11 (1.8)11 (2.5)0 (0.0)0 (0.0)
Antidepressants (SSRI, SNRI,NaSSA)16 (1.3)0 (0.0)0 (0.0)0 (0.0)0 (0.0)
Antidepressants (other)13 (1.1)8 (1.3)8 (1.8)0 (0.0)0 (0.0)
Sedatives (other)1 (0.1)1 (0.2)0 (0.0)1 (0.7)0 (0.0)
Anticonvulsants (except for mood stabilisers)1 (0.1)0 (0.0)0 (0.0)0 (0.0)0 (0.0)
Non-psychotropic drugs 519 (43.0) 280 (46.7) 144 (33.0) 121 (82.3) 15 (93.8)
Antihypertensives120 (9.9)46 (7.7)35 (8.0)11 (7.5)0 (0.0)
Laxatives115 (9.5)35 (5.8)11 (2.5)22 (15.0)2 (12.5)
Fluids and electrolytes84 (7.0)122 (20.3)80 (18.3)42 (28.6)0 (0.0)
Anticoagulants61 (5.1)6 (1.0)1 (0.2)5 (3.4)0 (0.0)
Anti-inflammatory drugs24 (2.0)3 (0.5)0 (0.0)2 (1.4)1 (6.3)
Antiallergic agents18 (1.5)5 (0.8)4 (0.9)1 (0.7)0 (0.0)
Cardiovascular drugs19 (1.6)12 (2.0)3 (0.7)9 (6.1)0 (0.0)
Antibiotics13 (1.1)10 (1.7)3 (0.7)6 (4.1)1 (6.3)
Chinese herbal medicines8 (0.7)7 (1.2)1 (0.2)1 (0.7)0 (0.0)
Peptic ulcer drugs7 (0.6)2 (0.3)0 (0.0)1 (0.7)1 (6.3)
Antidiabetics6 (0.5)9 (1.5)0 (0.0)9 (6.1)0 (0.0)
Lipid-lowering agents3 (0.3)2 (0.3)1 (0.2)1 (0.7)0 (0.0)
Other drugs41 (3.4)21 (3.5)5 (1.1)11 (7.5)5 (31.3)
All drugs 1207 (100) 600 (100) 437 (100) 147 (100) 16 (100)
  • ADEs, adverse drug events; BZDRA, benzodiazepine receptor agonists; MEs, medication errors; NaSSA, noradrenergic and specific serotonin antidepressants; SNRI, serotonin–norepinephrine reuptake inhibitor; SSRI, selective serotonin reuptake inhibitor.