The Authority/Pharmacotherapy Care model: an explanatory model of the drug use process in primary care.
BACKGROUND
Drug utilization studies have proliferated and many variants exist. Few models have been presented that account for all of the different types of studies and approaches.


OBJECTIVE
This article presents the Authority/Pharmacotherapy Care model, a structural-functional model of the drug use process that illustrates the factors involved in drug utilization and the relationships between factors. The concepts of authority and transfer of authority underlie the relationships.


METHODS
The drug use process is presented at the microlevel from the viewpoint of an individual who requires treatment with prescription drugs. The various categories of activity/authority (ie, level of patient care) are those of the individual, physician, pharmacist, patient, and drug. Influencing factors, both internal and external, impact upon each level of care. Three aspects must be considered at each level, which are structures, processes, and outcomes, according to Donabedian's model.


RESULTS
The result is a structural-functional model that depicts all of the major points in the drug use process, which might be used as a framework to categorize drug utilization studies.


CONCLUSIONS
This model may be used to represent the drug use process, identify the types of drug use studies, determine pertinent factors involved in the process, understand the relationships between factors, and help in evaluating drug use.
Einarson
Thomas R
TR
Leslie Dan Faculty of Pharmacy, Department of Health Policy, Management, and Evaluation, Faculty of Medicine, University of Toronto, Toronto, ON M5S 2S2, Canada. t.einarson@utoronto.ca
D004358:Drug Therapy; D004363:Drug Utilization; D006801:Humans; D008962:Models, Theoretical; D010819:Physician's Role; D010817:Physician-Patient Relations; D011320:Primary Health Care