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
Solution1:10 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:10 000 as a percentage strength p (% w/v).

1:10 000
p = %
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 3.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v3.5 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 0.41 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.41 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
50%dextrose+5%dextrose? mL20%1500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1500 mL of 20% dextrose by mixing 50% and 5% dextrose. How many mL V of the 5% solution do you need? Round to the nearest whole mL.

50%5%20%1500 mL
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 1.7 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 400 mg. Draw up the dose: what volume V do you give?

2000 mg1.7 mL + 0.8 mL400 mg
V = mL

Answer key

  1. 1. p = 0.01 %
  2. 2. V = 0.7 mL
  3. 3. V = 0.41 mL
  4. 4. V = 4.6 mL
  5. 5. V = 1000 mL
  6. 6. V = 0.5 mL

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