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

2% w/v92 mg
V = mL
2.Easy
glycerin62.5 g250 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 62.5 g of glycerin is dissolved in water to a total volume of 250 mL. What is the percentage strength p (% w/v)?

62.5 g250 mL
p = %
3.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
4.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.1000 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 1000 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1000 mg
V = mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 4.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 1400 mg. Draw up the dose: what volume V do you give?

2000 mg4.2 mL + 0.8 mL1400 mg
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 400 mg. Draw up the dose: what volume V do you give?

1000 mg9.4 mL + 0.6 mL400 mg
V = mL

Answer key

  1. 1. V = 4.6 mL
  2. 2. p = 25 %
  3. 3. C = 250 mg/mL
  4. 4. V = 10 mL
  5. 5. V = 3.5 mL
  6. 6. V = 4 mL

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