Background. Few peer-reviewed reports have been published that documen
t the extent and type of use of published formularies in general pract
ice. As publishers of the Practice Formulary of the Royal College of G
eneral Practitioners, the Northern Ireland Faculty Board commissioned
a large-scale survey to quantify these issues, for the purpose of impr
oving the revision process. Aim. The aim of the survey was to investig
ate the extent to which general practitioners in Northern Ireland use
the Practice Formulary and the ways in which they use it, and to elici
t their opinions on ways in which it could be improved. Results. A tot
al of 371 completed questionnaires were received (response rate of 38%
), 49 respondents (13%) stating that they had not received the formula
ry. Out of the 322 respondents who had received it, 84% used the formu
lary occasionally, and 41% either had or were producing their own prac
tice formulary (32% of these had used the RCGP formulary in its produc
tion). Almost all respondents (90%) considered a formulary useful in g
eneral practice. The presentation and layout was approved by 273 respo
ndents (85%) and 259 (80%) agreed strongly with the drug selection. Th
e formulary was used as a source of drugs information by 191 responden
ts (59%) and as a teaching aid by 103 (32%). A total of 65 criticisms
or suggestions for improving the next edition were received. Revision
is now under way and 18 of the original respondents have volunteered t
o be members of the revision committee. No judgement was made about th
e non-respondents. Conclusion. The largest survey yet conducted of pub
lished formulary use in one region elicited the extent of use, type of
use, criticisms and suggestions for improvement These suggestions are
being used as a guide to revision of the next edition.