cardiac arrest: 1-1.5 mg/kg IV repeated every 3-5 min up to 3 mg/kg, follow conversion with a drip of 2 to 4 mg/min. Ped: 1 mg/kg IV, repeat/3-5 min up to 3 mg/kg, follow conversion with a drip of 20 to 50 mcg/kg/min. ventricular tachycardia: 1-1.5 mg/kg slow IV. Consider lower dose for elderly. May repeat at one-half dose every 5 to 10 min until conversion up to 3 mg/kg. Follow conversion with an infusion of 2-4 mg/min. Ped: 1 mg/kg, followed by a drip at 20-50 mg/kg/min.