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
Solution1:250? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:250 as a percentage strength p (% w/v).

1:250
p = %
2.Easy
sodium chloride4.5 g500 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 4.5 g of sodium chloride is dissolved in water to a total volume of 500 mL. What is the percentage strength p (% w/v)?

4.5 g500 mL
p = %
3.Medium
ceftriaxone 1 gAdd 9.6 mL sterile water.Powder volume: 0.4 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 1000 mg as a powder. The practice label says to add 9.6 mL of sterile water; the powder adds 0.4 mL to the volume. What is the concentration C in mg/mL after reconstitution?

1000 mg9.6 mL+0.4 mL
C = mg/mL
4.Medium
cefuroxime 750 mgAdd 7.2 mL sterile water.Powder volume: 0.3 mL.? 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. What is the concentration C in mg/mL after reconstitution?

750 mg7.2 mL+0.3 mL
C = mg/mL
5.Hard
23%sodium chloride? mL+3%sodium chloride8%300 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 300 mL of 8% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.

23%3%8%300 mL
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 400 mg. Draw up the dose: what volume V do you give?

1000 mg9.5 mL + 0.5 mL400 mg
V = mL

Answer key

  1. 1. p = 0.4 %
  2. 2. p = 0.9 %
  3. 3. C = 100 mg/mL
  4. 4. C = 100 mg/mL
  5. 5. V = 75 mL
  6. 6. V = 4 mL

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