Although sulfonylureas don't actually cause hypoglycemia (low blood glucose) by themselves, if combined with other medications, vigorous exercise or too little food, they can make your blood glucose drop too low.
Since low blood glucose can be dangerous, make sure that you and your family know the symptoms. These include feeling shaky, sweaty, hungry, and irritable. If you have these symptoms, take some quick-acting sugar. Good sources are three or four glucose tablets, a half-cup of fruit juice or regular soda, or a tablespoon of honey or sugar.