Patients off midazolam sedation after receiving study drug and no longer manifesting clinically important systemic signs of scorpion envenomation will be discharge at 4 hours, or 2 hours following cessation of midazolam drip, whichever occurs later. Prior to discharge repeat lab work, physical assessments, and vital signs will be done. Patients still requiring midazolam sedation and/or manifesting clinically important systemic signs of scorpion envenomation will be treated with standard of care for the duration of clinical symptoms. Those remaining for extended care undergo final study assessments at time of hospital discharge or at 24 hours after study drug infusion if hospitalization continues.