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

0.5% w/v11.5 mg
V = mL
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 8.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v8.5 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.78 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.78 mg
V = mL
4.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.45 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.45 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 75 mg. Draw up the dose: what volume V do you give?

250 mg9.6 mL + 0.4 mL75 mg
V = mL
6.Hard
20%chlorhexidine+0%water? mL4%500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 500 mL of 4% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%4%500 mL
V = mL

Answer key

  1. 1. V = 2.3 mL
  2. 2. V = 1.7 mL
  3. 3. V = 7.8 mL
  4. 4. V = 0.45 mL
  5. 5. V = 3 mL
  6. 6. V = 400 mL

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