Background:

Clinical pharmacists have demonstrated their ability to improve patient outcomes over usual care for patients with type 2 diabetes and glycemic levels above goal, though reasons for this are not well defined. Numerous medications exist for the management of patients with type 2 diabetes and different patterns of medication use by clinical pharmacists may explain these benefits.

Objective:

The objective of this study was to compare pharmacotherapy approaches to managing patients with uncontrolled type 2 diabetes receiving basal insulin by a clinical pharmacist versus usual care by a physician or advanced practice provider in a federally qualified health center.

Methods:

A retrospective cohort study of patients 18 to 85 years old with type 2 diabetes, A1C ≥9%, receiving basal insulin was conducted. Patients were grouped into two cohorts (1) those who received clinical pharmacist care and (2) those who received usual care from a physician or advanced practice provider. The primary outcome evaluated the proportion of patients treated with the addition of a non-basal insulin medication. Type of medication changes or additions as well as change in A1C and change in weight were also analyzed. Outcomes were evaluated at six months post-index A1C.

Results:

A total of 202 patients were identified (n=129 in the usual care group and n=73 in the clinical pharmacist group). A non-basal insulin medication was added in 29% of patients receiving usual care versus 41% of patients receiving clinical pharmacist care (adjusted p=0.040). Usual care providers more frequently added metformin, sulfonylureas and thiazolidinediones, while clinical pharmacists more frequently added prandial insulin, DPP-4 inhibitors, GLP-1 agonists, and SGLT-2 inhibitors. A1C decreased 1.6% in the clinical pharmacist group versus 0.9% in the usual care group (adjusted p=0.055). No significant change in weight was observed between the clinical pharmacist and usual care group (0.2 kg versus -1.0 kg, respectively; adjusted p=0.175).

Conclusions:

Pharmacotherapy approaches to managing patients with uncontrolled type 2 diabetes varied between clinical pharmacists and other clinician providers. For patients already on basal insulin, clinical pharmacists were more likely to intensify therapy with the addition of non-basal insulin, including more frequent initiation of prandial insulin and by adding newer antihyperglycemic agents.

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