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 44 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v44 mg
V = mL
2.Easy
0123455 mL

A solution is 5% w/v. You need 190 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v190 mg
V = mL
3.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.1500 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. The prescribed dose is 1500 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1500 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.54 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.54 mg
V = mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 480 mg. Draw up the dose: what volume V do you give?

2000 mg9.2 mL + 0.8 mL480 mg
V = mL
6.Hard
0123455 mL

A vial holds 250 mg of powder. You add 4.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 215 mg. Draw up the dose: what volume V do you give?

250 mg4.4 mL + 0.6 mL215 mg
V = mL

Answer key

  1. 1. V = 2.2 mL
  2. 2. V = 3.8 mL
  3. 3. V = 15 mL
  4. 4. V = 5.4 mL
  5. 5. V = 2.4 mL
  6. 6. V = 4.3 mL

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