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A 29 year-old-man has been admitted after sustaining an open tibial fracture in a rugby match. He is diaphoretic and angry about being rushed through the ED for admission onto the general hospital floor without letting him check on who might have his car. His girlfriend says he stopped using cocaine last year. The current heart rate is 119 BPM per the pulse oximeter he just ripped off before it showed a 100% reading on room air. There are no other vital signs available, no lab results have come back, an EKG has not been completed, and there is no IV in place. What medication will you deliver IM to provide for calm, and why?