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

0.5% w/v22.5 mg
V = mL
2.Easy
Solution1:2 500? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:2 500 as a percentage strength p (% w/v).

1:2 500
p = %
3.Medium
cefuroxime 750 mgAdd 7.2 mL sterile water.Powder volume: 0.3 mL.450 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 450 mg. What volume V do you draw up? Round to one decimal place.

750 mg7.2 mL+0.3 mL450 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.3 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.3 mg
V = mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 9.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 50 mg. Draw up the dose: what volume V do you give?

500 mg9.8 mL + 0.2 mL50 mg
V = mL
6.Hard
70%dextrose? mL+10%dextrose30%600 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 30% dextrose by mixing 70% and 10% dextrose. How many mL V of the 70% solution do you need? Round to the nearest whole mL.

70%10%30%600 mL
V = mL

Answer key

  1. 1. V = 4.5 mL
  2. 2. p = 0.04 %
  3. 3. V = 4.5 mL
  4. 4. V = 3 mL
  5. 5. V = 1 mL
  6. 6. V = 200 mL

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