Although these reactions often cannot be prevented, one should always take medicines as prescribed by the doctor. A person with diabetes can watch his or her blood glucose at home. Medicine can be changed by the doctor if a person notices that his or her blood glucose levels have been on the low side. Sometimes, this change can be made before a severe episode of hypoglycemia occurs.
It is now thought that repeated or long episodes of hypoglycemia can cause permanent, mild brain damage. Severe hypoglycemia, if left untreated, can lead to a coma or death.