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 2% w/v. You need 66 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v66 mg

V = mL

2.Easy

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:400 as a percentage strength p (% w/v).

1:400

p = %

3.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 18.2 mL of diluent. The prescribed dose is 750 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL750 000 units

V = mL

4.Medium

A solution has a ratio strength of 1:1000. You need 0.85 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.85 mg

V = mL

5.Hard

A vial holds 500 mg of powder. You add 2.3 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 240 mg. Draw up the dose: what volume V do you give?

500 mg2.3 mL + 0.2 mL240 mg

V = mL

6.Hard

A vial holds 1000 mg of powder. You add 3.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 650 mg. Draw up the dose: what volume V do you give?

1000 mg3.6 mL + 0.4 mL650 mg

V = mL

Answer key

1. V = 3.3 mL
2. p = 0.25 %
3. V = 3 mL
4. V = 0.85 mL
5. V = 1.2 mL
6. V = 2.6 mL

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