Monotherapy: Dizziness. Combination w/ metformin: Tremor, dizziness, headache. Combination w/ sulfonylureas: Tremor, headache, dizziness, asthenia. Combination w/ thiazolidinediones: Increased wt; peripheral edema. Combination w/ insulin: Headache, nausea, GERD; chills; decreased blood glucose. Combination w/ metformin & sulfonylureas: Dizziness, tremor, asthenia, hypoglycemia; hyperhidrosis.