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
0123455 mL

A solution is 2% w/v. You need 86 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v86 mg
V = mL
2.Easy
epinephrine1:1 0000.5 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of epinephrine has a ratio strength of 1:1 000. How many milligrams m are in 0.5 mL?

1:1 0000.5 mL
m = mg
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.16 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.16 mg
V = mL
4.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
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 1.9 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 200 mg. Draw up the dose: what volume V do you give?

250 mg1.9 mL + 0.6 mL200 mg
V = mL
6.Hard
20%chlorhexidine+0%water? mL5%300 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 300 mL of 5% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%5%300 mL
V = mL

Answer key

  1. 1. V = 4.3 mL
  2. 2. m = 0.5 mg
  3. 3. V = 1.6 mL
  4. 4. C = 200 mg/mL
  5. 5. V = 2 mL
  6. 6. V = 225 mL

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