Propranolol is contraindicated in diabetes mellitus because it: (A) Causes hyperglycemia, (B) uses seizures, (C) Masks the hypoglycemic symptoms, (D) Causes hypotension
Answer is C. Ref; KD Tripathi pharmacology 7th edition (page no; 146) Propranolol delays recovery from hypoglycemia due to insulin and oral antidiabetics. It masks the warning signs of hypoglycaemia mediated through sympathetic stimulation (tachycardia, tremor).