NAPLEX QBANK Pharmaceutical Calculations Questions and Answers

Question 1

A patient is to receive an IV infusion of 0.9% NaCl with 20 mEq of KCl over 8 hours.
The total volume of the IV bag is 1000 mL.
The IV administration set delivers 15 gtt/mL.
What is the correct flow rate in drops per minute (gtt/min)?

Accepted Answer

31 gtt/min

Answer

21 gtt/min

Answer

15 gtt/min

Answer

125 gtt/min

Question 2

A pharmacist needs to prepare 120 g of a 2.5% hydrocortisone cream by mixing 1% and 5% hydrocortisone creams. How many grams of the 5% cream are required?

Accepted Answer

45 g

Answer

75 g

Answer

60 g

Answer

30 g

Question 3

A prescription for a pediatric patient weighing 44 lbs is for amoxicillin 30 mg/kg/day, divided into two daily doses. The pharmacy has amoxicillin oral suspension with a concentration of 250 mg/5 mL. How many mL should be dispensed for each dose?

Accepted Answer

6 mL

Answer

12 mL

Answer

15 mL

Answer

7.5 mL

Question 4

Which of the following represents the correct calculation for the osmolarity (mOsmol/L) of a 3% hypertonic saline (NaCl) solution? (MW of Na = 23, MW of Cl = 35.5)

Accepted Answer

(30 g/L / 58.5 g/mol) * 2 * 1000

Answer

(30 g/L / 58.5 g/mol) * 1 * 1000

Answer

(3 g/L / 58.5 g/mol) * 2 * 1000

Answer

(30 g/L / 94.5 g/mol) * 2 * 1000

Question 5

A patient's creatinine clearance is calculated to be 45 mL/min. The standard dose of Drug X is 500 mg every 12 hours for patients with a CrCl > 60 mL/min. The dosing guidelines recommend a 50% dose reduction for patients with a CrCl between 30-60 mL/min. What is the appropriate adjusted daily dose for this patient?

Accepted Answer

500 mg

Answer

1000 mg

Answer

250 mg

Answer

750 mg

Question 6

You are asked to compound 240 mL of a 1:500 (w/v) solution. The drug is available as a pure powder. How many milligrams of the drug powder are needed?

Accepted Answer

480 mg

Answer

120 mg

Answer

240 mg

Answer

500 mg

A patient is to receive an IV infusion of 0.9% NaCl with 20 mEq of KCl over 8 hours.The total volume of the IV bag is 1000 mL.The IV administration set delivers 15 gtt/mL.What is the correct flow rate in drops per minute (gtt/min)?

A patient is to receive an IV infusion of 0.9% NaCl with 20 mEq of KCl over 8 hours.
The total volume of the IV bag is 1000 mL.
The IV administration set delivers 15 gtt/mL.
What is the correct flow rate in drops per minute (gtt/min)?