Pharmacy calculations worksheet with answers

Free printable Pharmacy calculations worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy
Solution1:400? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:400 as a percentage strength p (% w/v).

1:400
p = %
2.Easy
Solution1:1 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:1 000 as a percentage strength p (% w/v).

1:1 000
p = %
3.Medium
cefazolin 1 gAdd 4.5 mL sterile water.Powder volume: 0.5 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains cefazolin 1000 mg as a powder. The practice label says to add 4.5 mL of sterile water; the powder adds 0.5 mL to the volume. What is the concentration C in mg/mL after reconstitution?

1000 mg4.5 mL+0.5 mL
C = mg/mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.1500 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains oxacillin 2000 mg as a powder. The practice label says to add 11.5 mL of sterile water; the powder adds 1 mL to the volume. The prescribed dose is 1500 mg. What volume V do you draw up? Round to one decimal place.

2000 mg11.5 mL+1 mL1500 mg
V = mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 360 mg. Draw up the dose: what volume V do you give?

2000 mg9.8 mL + 0.2 mL360 mg
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 4.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 110 mg. Draw up the dose: what volume V do you give?

500 mg4.8 mL + 0.2 mL110 mg
V = mL

Answer key

  1. 1. p = 0.25 %
  2. 2. p = 0.1 %
  3. 3. C = 200 mg/mL
  4. 4. V = 9.4 mL
  5. 5. V = 1.8 mL
  6. 6. V = 1.1 mL

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