MS-2009

A 67-year-old man visits his primary care physician complaining of excessive thirst and frequent urination. He has no medical history and is not on any medications. He is a non-smoker and does not consume alcohol.

His HbA1c level is 50 mmol/mol (<48). Despite attempting to manage his condition through diet and exercise, his HbA1c level remains unchanged. What is the probable mechanism of action of the medication that will likely be prescribed?