A 32-year-old man from Delhi presents to the emergency department with severe anxiety, body aches, sweating, and insomnia for the past 36 hours. He reports last using heroin 2 days ago and is now requesting immediate relief. Vital signs show: HR 110/min, BP 145/92 mmHg, RR 20/min, temperature 37.8°C. Pupil size is 4 mm bilaterally. Which of the following is the most appropriate immediate pharmacological intervention?

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