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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
potassium permanganate1:10 000500 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:10 000. How many milligrams m are in 500 mL?

1:10 000500 mL
m = mg
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 11.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v11.5 mg
V = mL
3.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
4.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.750 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 1000 mg as a powder. The practice label says to add 3.5 mL of sterile water; the powder adds 0.5 mL to the volume. The prescribed dose is 750 mg. What volume V do you draw up? Round to one decimal place.

1000 mg3.5 mL+0.5 mL750 mg
V = mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 3.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 350 mg. Draw up the dose: what volume V do you give?

2000 mg3.2 mL + 0.8 mL350 mg
V = mL
6.Hard
10%120 g+2%salicylic acid? g5%salicylic acid

Practice exercise (made-up values, not clinical guidance). You have 120 g of 10% salicylic acid ointment. How many grams m of 2% salicylic acid ointment must you add to make a 5% ointment? Round to the nearest whole gram.

120 g · 10%2%5%
m = g

Answer key

  1. 1. m = 50 mg
  2. 2. V = 2.3 mL
  3. 3. V = 9.4 mL
  4. 4. V = 3 mL
  5. 5. V = 0.7 mL
  6. 6. m = 200 g

Full step-by-step solutions: practise this topic on examproblems.com.