Fortunately for me I'm on Metformin anyway.The classic oral meds to cause hypoglycemia are the sulfonylureas (Glipizide, Glyburide, etc). On the other hand, Metformin is not commonly associated with hypoglycemia and is a better choice -- for diving, that is, as long as it's also the best medication for the diver the other 350 or so days per year.