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
Solution1:2 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:2 000 as a percentage strength p (% w/v).

1:2 000
p = %
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 22 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v22 mg
V = mL
3.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.12 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.12 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.46 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.46 mg
V = mL
5.Hard
23%sodium chloride? mL+3%sodium chloride5%1000 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1000 mL of 5% 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%5%1000 mL
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 3.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 425 mg. Draw up the dose: what volume V do you give?

500 mg3.6 mL + 0.4 mL425 mg
V = mL

Answer key

  1. 1. p = 0.05 %
  2. 2. V = 4.4 mL
  3. 3. V = 0.12 mL
  4. 4. V = 4.6 mL
  5. 5. V = 100 mL
  6. 6. V = 3.4 mL

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