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 5% w/v. You need 165 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v165 mg

V = mL

2.Easy

Practice exercise (made-up values, not clinical guidance). How many g of sodium bicarbonate are in 50 mL of 8.4% w/v solution? Find m.

8.4% w/v50 mL

m = g

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 1:10 000. You need 0.4 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.4 mg

V = mL

5.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 640 mg. Draw up the dose: what volume V do you give?

2000 mg9.4 mL + 0.6 mL640 mg

V = mL

6.Hard

A vial holds 2000 mg of powder. You add 4.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 480 mg. Draw up the dose: what volume V do you give?

2000 mg4.5 mL + 0.5 mL480 mg

V = mL

Answer key

1. V = 3.3 mL
2. m = 4.2 g
3. V = 3 mL
4. V = 4 mL
5. V = 3.2 mL
6. V = 1.2 mL

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