Adult & adolescent ≥12 yr, at least 40 kg Single loading dose of 200 mg on day 1 via IV infusion over 30-120 min on day 1 followed by once daily maintenance doses of 100 mg on day 2. Recommended treatment duration for patients not requiring invasive mechanical ventilation &/or extracorporeal membrane oxygenation (ECMO): 5 days, treatment may be extended for up to 5 days if the patient does not demonstrate clinical improvement.