PLE-5764

A 50-year-old male with type II DM, who has been on metformin for nine years, presents with symptoms of diarrhea, paresthesia, and muscular weakness. On examination, he exhibits hyperactive deep tendon reflexes. Blood electrolyte levels reveal serum sodium (Na) of 138 mEq/L, serum potassium (K) of 3.4 mEq/L, serum calcium (Ca) of 8.2 mg/dL, and serum magnesium (Mg) of 0.8 mEq/L. Which of the following medications should be avoided to prevent exacerbation of his symptoms?