MS-3179

A 67-year-old retired firefighter visits the clinic complaining of recurring burning chest pain. He reports that the pain worsens after consuming take-away food and alcohol, and he experiences increased belching. The patient has a medical history of high cholesterol, type two diabetes, and osteoarthritis. He is currently taking atorvastatin, metformin, gliclazide, naproxen, and omeprazole, which he frequently forgets to take. Which medication is the probable cause of his symptoms?