A 32-year-old male presents to the emergency department following a high-speed motor vehicle collision. On primary survey, he is found to be in hemorrhagic shock (BP 80/50 mmHg, HR 130/min, respiratory distress). After securing two large-bore IVs and initiating rapid fluid resuscitation, what is the drug of choice for immediate management of his hypotension if he does not respond to 2 liters of crystalloid within 10 minutes?