Table 2.

Number of medication errors by type, and most frequent ATC codes for each type of error.

Type of error	Medication errors; numbers (%)	The three most frequent ATC codes by type of error; number of errors
		B03	C07	N02	N05	N06	R03
Omission of drug	417 (62)			37	37		47
Dose too high	86 (13)	8		9	11
Dose too low	82 (12)			11	12	7
Additional drug	79 (12)			7	8		8
Wrong dosage form	8 (1)		3	3			2
Total	672 (100)			67	68		57

ATC-codes: B03, Antianemic preparations; C07, Beta-blocking agents; N02, Analgesics; N05, Psycholeptics; N06, Psychoanaleptics; R03, Drugs for obstructive pulmonary disease

ATC, Anatomic Therapeutic Chemical