An order of Rocephin 500 mg IV q 12 h has been ordered for a child who weighs 33 pounds. According to the drug guide, the safe dose for this medication is 75 mg/kg/day divided into q 12 h doses. What is the safe dosage (of a single dose) of this med for this patient?

The safe dose for Rocephin is 75 mg/kg/day. First, convert the child's weight from pounds to kg: 33 lbs / 2.2 = 15 kg. Then, calculate the safe daily dose: 75 mg/kg/day x 15 kg = 1125 mg/day. Since the dose is divided q 12 h, divide the daily dose by 2 to get the safe dose for each administration: 1125 mg/day / 2 = 562.5 mg q 12 h. Therefore, the correct answer is 562.5 mg. Other choices are incorrect because they do not follow the correct calculation based on the given information.