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A 74-year-old man with type 2 diabetes is brought to the emergency department by his wife because he has become sweaty, tremulous and muddled at home. His capillary glucose is 3.0 mmol/L. He is drowsy but rousable, follows simple instructions and swallows safely. His medicines are gliclazide, acarbose, ramipril and atorvastatin. He has no intravenous access and the cannulation trolley is several minutes away. Which one of the following should he be given now?
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