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

A solution is 0.5% w/v. You need 10.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v10.5 mg

V = mL

2.Easy

A solution is 1% w/v. You need 7 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v7 mg

V = mL

3.Medium

A solution has a ratio strength of 1:1000. You need 0.76 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.76 mg

V = mL

4.Medium

Practice exercise (made-up values, not clinical guidance). A vial of penicillin G contains 5 000 000 units. Its practice label gives three strengths (see the table). You add 8.2 mL of diluent. The prescribed dose is 2 400 000 units. What volume V do you draw up? Round to one decimal place.

8.2 mL → 500 000 units/mL2 400 000 units

V = mL

5.Hard

A vial holds 1000 mg of powder. You add 1.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 850 mg. Draw up the dose: what volume V do you give?

1000 mg1.5 mL + 0.5 mL850 mg

V = mL

6.Hard

A vial holds 2000 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 520 mg. Draw up the dose: what volume V do you give?

2000 mg9.4 mL + 0.6 mL520 mg

V = mL

Answer key

1. V = 2.1 mL
2. V = 0.7 mL
3. V = 0.76 mL
4. V = 4.8 mL
5. V = 1.7 mL
6. V = 2.6 mL

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