Identifying ideal pharmacist-to-patient ratios for the successful provision of clinical pharmacy services

Clinical pharmacists add significant value to the health care team and are associated with reduced hospital mortality, drug costs, length of stay, and adverse drug reactions. However, there remains a paucity of evaluative data regarding optimal clinical pharmacy practice models. Identifying optimal patient (or bed)-to-clinical pharmacist ratios is one mechanism to assess the allocation of resources. The ACCP Task Force on Clinical Pharmacy Services was charged with developing a white paper to examine optimal ratios in different care settings, considering confounders and other factors that affect the interpretation of ratio data. The committee performed an extensive search of the pharmacy, medical, and nursing literature to identify existing data on provider-to-patient ratios. Recommendations on ratios are mainly from survey data or statements from various health care organizations. Many factors affect the capacity of clinical pharmacists to achieve patient care and non-patient care responsibilities. Examples include general differences in baseline expectations; nonstandardized program performance metrics; variable hospital/practice setting types; variable patient acuity and complexity; competing priorities and other resources; industry-wide rates of and variability in addressing burnout; inconsistent means for justifying numbers and historical corporate structures; and external endorsements and mandates. Although some areas of practice such as critical care pharmacy have more robust evidence for specific ratios, others such as pediatrics are far less clear. A clinical pharmacist ratio must be established as a starting point. This will allow for better allocation today and serve as a springboard for future determinations. Furthermore, clinical pharmacist ratios should be preserved to offer reliable patient care 365 days per year. As clinical pharmacist services shift from beneficial to essential, continuous daily patient care services must be the practice model moving forward.