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
potassium chloride10 g200 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 10 g of potassium chloride is dissolved in water to a total volume of 200 mL. What is the percentage strength p (% w/v)?

10 g200 mL
p = %
2.Easy
0123455 mL

A solution is 1% w/v. You need 6 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v6 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.62 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.62 mg
V = mL
4.Medium
cefuroxime 750 mgAdd 7.2 mL sterile water.Powder volume: 0.3 mL.225 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 mL to the volume. The prescribed dose is 225 mg. What volume V do you draw up? Round to one decimal place.

750 mg7.2 mL+0.3 mL225 mg
V = mL
5.Hard
90%ethanol+0%water? mL45%300 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 300 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%300 mL
V = mL
6.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 480 mg. Draw up the dose: what volume V do you give?

1000 mg9.2 mL + 0.8 mL480 mg
V = mL

Answer key

  1. 1. p = 5 %
  2. 2. V = 0.6 mL
  3. 3. V = 6.2 mL
  4. 4. V = 2.3 mL
  5. 5. V = 150 mL
  6. 6. V = 4.8 mL

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