One has to be careful about hypoglycaemia when patient gives history of taking this drug:

Chlorpropamide: It is a long-acting sulfonylurea oral hypoglycaemic, found to reduce urine volume in DI of pituitary origin, but not in renal DI. It sensitizes the kidney to ADH action.  DI = Diabetes Insipidus. Due to its long duration of action, one has to be careful about hypoglycaemia, when patient gives history of taking this drug. Reference: Essentials of Medical Pharmacology Eighth Edition KD  TRIPATHI  page no 644