[A case of hypoglycemia caused by the accidental ingestion of glimepiride in an elderly dementia patient diagnosed based on the serum glimepiride concentration].

A 77-year-old man being treated for Alzheimer-type dementia and an old cerebral infarction was admitted to our hospital due to disturbance of consciousness. The patient's Mini-mental State Examination and Hasegawa Dementia Scale scores were 23 and 17 points, respectively. His blood glucose level was low (18 mg/dl), with a relatively high insulin level (15.