Table 2.

Drug classes implicated in ADRs according to the WHO-ATC classification system (n = 159 study participants)

WHO-ATC class		ADRs, n	% all ADRs
A	Alimentary tract and metabolism	18	8.53
A02	Drugs for acid-related disorders	10	4.74
A07	Antidiarrhoeal, intestinal anti-inflammatory/anti-infective agents	1	0.47
A10	Drugs used in diabetes	5	2.37
A11	Vitamins	1	0.47
A12	Mineral supplements	1	0.47
B	Blood and blood forming organs	4	1.90
B01	Antithrombotic agents	3	1.42
B03	Antianaemic preparations	1	0.47
C	Cardiovascular system	69	32.70
C01	Cardiac therapy	5	2.37
C02	Antihypertensives	2	0.95
C03	Diuretics	13	6.16
C07	Beta blocking agents	4	1.90
C08	Calcium channel blockers	17	8.06
C09	Agents acting on the renin-angiotensin system	19	9.00
C10	Lipid-modifying agents	9	4.27
G	Genito-urinary system and sex hormones	10	4.74
G04	Urologicals	10	4.74
H	Systemic hormonal preparations, excluding sex hormones and insulins	4	1.90
H03	Thyroid therapy	3	1.42
H05	Calcium homeostasis	1	0.47
J	Anti-infectives for systemic use	26	12.32
J01	Antibacterials for systemic use	26	12.32
L	Antineoplastic and immunomodulating agents	1	0.47
L04	Immunosuppressants	1	0.47
M	Musculoskeletal system	14	6.64
M01	Anti-inflammatory and antirheumatic products	10	4.74
M05	Drugs for treatment of bone diseases	4	1.90
N	Nervous system	61	28.91
N01	Anaesthetics	4	1.90
N02	Analgesics	28	13.27
N03	Antiepileptics	7	3.32
N04	Anti-Parkinson’s drugs	1	0.47
N05	Psycholeptics	4	1.90
N06	Psychoanaleptics	16	7.58
N07	Other nervous system drugs	1	0.47
R	Respiratory system	4	1.90
R03	Drugs for obstructive airway diseases	2	0.95
R06	Cough and cold preparations	2	0.95

ADR = adverse drug reaction. WHO-ATC = World Health Organization Anatomical Therapeutic Code.