Hypoglycemia. Add-on combination w/ metformin & a PPARγ agonist: Headache, diarrhea, nausea, vomiting, URTI, cough, fungal skin infection, peripheral edema. Initial combination therapy w/ metformin: Diarrhea, dyspepsia, flatulence, vomiting, headache. Add-on combination w/ insulin: Flu, headache.