- The subject currently receives insulin, sulfonylurea or metformin (doses of rosiglitazone greater than 4 mg daily in combination with these therapies are not currently indicated; because this protocol uses the maximum recommended dose of 8 mg daily, subjects on insulin, sulfonylurea or metformin will be ineligible for participation in this trial); the subject is currently receiving thiazolidinediones; the subject is a diabetic not on treatment or hyperglycemic (has a random blood glucose level > 200 mg/dl); the subject has diabetic macular edema