Formulary decision making: identifying factors that influence P&T committee drug evaluations.

This study identifies outcomes related to hospital formulary decision making and estimates the importance of 16 specific types of data to five P & T Committees during the formulary decision making process. The two most important outcomes, according to the Committee members involved in this study, were the effects of the potential formulary addition on the quality of drug treatments available in the hospital followed by its impact on hospital costs. Information about the therapeutic advantage of the potential drug addition, the relative adverse effect profile, and cost information were viewed as especially important. On the other hand, promotional literature provided by pharmaceutical companies and letters of evaluation from respected physicians at hospitals other than their own, were not viewed as important. By understanding the factors involved in hospital formulary decision making, strategies encouraging optimal formulary decisions may be developed.