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
0123455 mL

A solution is 1% w/v. You need 37 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v37 mg
V = mL
2.Easy
lidocaine1% w/v5 mL? mg

Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 5 mL of 1% w/v solution? Find m.

1% w/v5 mL
m = mg
3.Medium
ceftriaxone 1 gAdd 9.6 mL sterile water.Powder volume: 0.4 mL.500 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 1000 mg as a powder. The practice label says to add 9.6 mL of sterile water; the powder adds 0.4 mL to the volume. The prescribed dose is 500 mg. What volume V do you draw up? Round to one decimal place.

1000 mg9.6 mL+0.4 mL500 mg
V = mL
4.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.400 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 400 mg. What volume V do you draw up? Round to one decimal place.

1000 mg3.5 mL+0.5 mL400 mg
V = mL
5.Hard
90%ethanol+0%water? mL45%600 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 45% ethanol from a 90% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

90%0%45%600 mL
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 330 mg. Draw up the dose: what volume V do you give?

1000 mg9.4 mL + 0.6 mL330 mg
V = mL

Answer key

  1. 1. V = 3.7 mL
  2. 2. m = 50 mg
  3. 3. V = 5 mL
  4. 4. V = 1.6 mL
  5. 5. V = 300 mL
  6. 6. V = 3.3 mL

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