hat is the most important information I should know about glipizide and metformin?Do not use glipizide and metformin if you have congestive heart failure or kidney disease, or if you are in a state of diabetic ketoacidosis (call your doctor for treatment with insulin).If you need to have any type of x-ray or CT scan using a dye that is injected into your veins, you will need to temporarily stop ta