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

Exercise 18

In Exercises 17, determine if the dosage ordered is safe. Then find the amount to administer.
The patient: 75-year-old female, 5 ft 3 in. tall, 198 lb, CL CR of 56 mL/min, diagnosed with hypertension and renal impairment. Ideal weight should be 152 lb.
Ordered: Vasotec 2.5 mg po qd
On hand: Vasotec 5-mg scored tablets
According to the package insert, the usual dose for patients with normal renal function (over 80 mL/min creatinine clearance) is 5 mg/day; for mild impairment (over 30 and up to 80 mL/min), 5 mg/day; for moderate to severe impairment (30 or less mL/min), 2.5 mg/day.