Cyclosporine
Sitagliptin plasma concentrations may be increased modestly (approximately 68%), which is not expected to be clinically important.
Digoxin
Digoxin plasma concentrations may be increased slightly (approximately 18%); no dosage adjustment is recommended.
Sulfonylurea (eg, tolbutamide)
A lower dose of the sulfonylurea may be needed to reduce the risk of hypoglycemia.