Nausea & vomiting. Sitagliptin: Hypoglycemia; abdominal pain, diarrhea, dyspepsia, flatulence; hypersensitivity reactions; exfoliative skin conditions including SJS; flu, headache, cutaneous vasculitis, acute pancreatitis. Worsening renal function. URTI, nasopharyngitis, constipation. Metformin: Anorexia; impaired absorption of various substances including vit B
12; metallic taste; wt loss.