Mills K A, Steele K and Irwin W G. A computerized audit of non-steroidal anti-inflammatory drug prescribing in general practice. Family Practice 1988; 5: 40–45.The two group practices based in a city health centre decided to prescribe non-steroidal anti-inflamma tory drugs in generic form from an agreed date. The practices' computer was used to identify the number of repeat prescriptions being issued for this group of drugs and to monitor the effectiveness of the changeover. Although both practices showed a marked increase in the level of generic prescribing there was considerable interpractice variation. Generic prescribing for one practice increased from 4% to 64% and for the other from 1% to 38% of repeat prescriptions issued for non-steroidal anti-inflammatory drugs over the study period. The reasons for this variation, the advantages of computerized audit and the problems associated with this self-imposed audit are discussed.