Explanation

Ethosuximide is an anticonvulsant used to treat absence seizures. It has no effect on blood sugar levels. Tolbutamide and Glibenclamide are sulfonylurea drugs used to lower blood glucose in diabetic patients. Glucagon (spelled as “Gluengon” in the options) is a hormone that raises blood sugar levels, not lowers them, but it is often listed in questions like this to confuse candidates. Since the question asks for the drug that is not hypoglycemic, the correct answer is Ethosuximide.