Table 2

The Bergen District Nursing Home (BEDNURS) study: the 10 drug classes (ATC therapeutic groups) most commonly involved in potential medication problems as identified by a multidisciplinary expert panel according to number and percentage of all drugs accounting for potential problems, and the three possible problems most frequently related to these drugs

Drugs accounting for potential problemsProblem categories most frequently related to the drugs
Therapeutic groupn%No. 1 problemnNo. 2 problemnNo. 3 problemn
Note that one single problem may address several prescriptions, and that one single prescription may account for several problems.
ADR=adverse drug reaction; NSAID=non-steroidal anti-inflammatory drug.
Antipsychotics40615.0Choice of drug208Drug-drug interaction139Risk for ADR51
ACE inhibitors33612.5Need for additional drug284Dosage too low31Drug-drug interaction20
Anxiolytics27010.0Dosage too high101Risk for ADR78Drug-drug interaction59
Antidepressants2378.8Drug-drug interaction98Risk for ADR76Unnecessary drug31
Loop diuretics1876.9Choice of drug66Dosage too low52Dosage too high27
Minerals1284.7Need for additional test103Dosage too low14Drug-drug interaction9
Hypnotics1234.6Dosage too high50Risk for ADR54Unnecessary drug20
Opioid analgesics1224.5Risk for ADR100Drug-drug interaction19Dosage too low2
NSAIDs1053.9Risk for ADR62Drug-drug interaction43
Antihistamines963.6Risk for ADR66Unnecessary drug22Wrong drug6
Sum201074.5
Others68825.5
Total2698100