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A 58-year-old man is brought to a regional emergency department after threatening a neighbour with a length of timber. He is shouting, will not sit, and has twice refused an oral wafer; the team judge that a cannula cannot be placed without risk of injury to staff. He has severe chronic obstructive pulmonary disease and uses oxygen at home, and has taken diazepam 30 mg daily on prescription for eleven years. Resuscitation equipment, monitoring and staff trained in resuscitation are immediately available, and the department stocks every drug listed below. Which one of the following should be given?
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