Pharmacy Technician PTCB Pharmacy Calculations 3

Question 1

A prescription for Metformin 500 mg reads '#60, 1 tab BID.' What is the days supply?

Accepted Answer

30 days

Answer

60 tablets ÷ 2 tablets/day (BID) = 30 days supply.

Question 2

A child weighs 22 lbs. The recommended dose is 10 mg/kg/day divided BID. What is each individual dose?

Accepted Answer

50 mg

Answer

22 lbs ÷ 2.2 = 10 kg; 10 mg/kg × 10 kg = 100 mg/day ÷ 2 = 50 mg per dose.

Question 3

A TPN bag contains 500 mL of dextrose 50% (D50W). How many grams of dextrose are in the bag?

Accepted Answer

250 g

Answer

50% w/v = 50 g per 100 mL; 50 g/100 mL × 500 mL = 250 g of dextrose.

Question 4

If 1 teaspoon equals 5 mL, how many teaspoons are in a 150 mL bottle?

Accepted Answer

30 tsp

Answer

150 mL ÷ 5 mL/tsp = 30 teaspoons.

Question 5

A powder for reconstitution has a powder volume of 10 mL. Adding 90 mL of water gives a final concentration of 250 mg/5 mL. What is the total volume after reconstitution?

Accepted Answer

100 mL

Answer

Total volume = diluent volume + powder volume = 90 mL + 10 mL = 100 mL.

Pharmacy Practice Test

Pharmacy Practice Test

Pharmacy Technician PTCB Pharmacy Calculations 3