Math and Dosage Calculations for Health Care 3rd Edition by James Whaley, Kathryn Booth, Booth Kathryn

Exercise 121

In Exercises 14, determine if the order is safe. If it is, then determine the amount to administer.
The patient is a 58-lb child with severe infection. Ordered: Erythromycin 650 mg PO tid.
On hand: Refer to label C. According to the package insert, in mild to moderate infections the usual dosage of erythromycin ethylsuccinate for children is 30 to 50 mg/kg/day in equally divided doses every 6 hours. For more severe infections this dosage may be doubled. If twice-a-day dosage is desired, one-half of the total daily dose may be given every 12 hours. Doses may also be given three times daily by administering one-third of the total daily dose every 8 hours.