Allergic reactions. Headache; diarrhea; vomiting. In combination w/ insulin: Flu. In combination w/ metformin: Indigestion, flatulence. In combination w/ pioglitazone: Decreased blood sugar w/o symptoms of hypoglycemia. In combination w/ metformin & rosiglitazone: Hypoglycemia, upper resp infection, nausea, cough, fungal skin infection, swelling of the hands or legs. Hypersensitivity reactions including anaphylaxis, angioedema, rash, urticaria, cutaneous vasculitis & exfoliative skin conditions including SJS.