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
Solution1:2 500? % 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 = %
2.Easy
0123455 mL

A solution is 5% w/v. You need 95 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v95 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.22 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.22 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.48 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.48 mg
V = mL
5.Hard
23%sodium chloride+3%sodium chloride? mL13%400 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 400 mL of 13% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 3% solution do you need? Round to the nearest whole mL.

23%3%13%400 mL
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 160 mg. Draw up the dose: what volume V do you give?

500 mg9.4 mL + 0.6 mL160 mg
V = mL

Answer key

  1. 1. p = 0.04 %
  2. 2. V = 1.9 mL
  3. 3. V = 2.2 mL
  4. 4. V = 4.8 mL
  5. 5. V = 200 mL
  6. 6. V = 3.2 mL

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