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 0.5% w/v. You need 21.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v21.5 mg
V = mL
2.Easy
0123455 mL

A solution is 2% w/v. You need 30 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v30 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.82 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.82 mg
V = mL
4.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.? 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. What is the concentration C in mg/mL after reconstitution?

1000 mg3.5 mL+0.5 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 230 mg. Draw up the dose: what volume V do you give?

1000 mg9.2 mL + 0.8 mL230 mg
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 4.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 1160 mg. Draw up the dose: what volume V do you give?

2000 mg4.5 mL + 0.5 mL1160 mg
V = mL

Answer key

  1. 1. V = 4.3 mL
  2. 2. V = 1.5 mL
  3. 3. V = 8.2 mL
  4. 4. C = 250 mg/mL
  5. 5. V = 2.3 mL
  6. 6. V = 2.9 mL

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