An 80-year-old male with long-standing type 2 diabetes and a hemoglobin A1c of 6.9%, is seen in clinic for a routine follow up. Diabetes medications include metformin and glipizide. Complications include peripheral neuropathy and retinopathy. He also has hypertension, controlled with beta-blockers and benign prostatic hyperplasia. He notes occasional episodes of nausea, diaphoresis, and mild confusion, which are relieved with eating a small snack.

What would be the most appropriate change to his regimen at this time?