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

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 20 mL of 50% w/v solution? Find m.

50% w/v20 mL

m = g

2.Easy

A solution is 2% w/v. You need 78 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v78 mg

V = mL

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 3.2 mL of diluent. The prescribed dose is 1 200 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL1 200 000 units

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 18.2 mL of diluent. The prescribed dose is 2 400 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL2 400 000 units

V = mL

5.Hard

A vial holds 1000 mg of powder. You add 2.3 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 640 mg. Draw up the dose: what volume V do you give?

1000 mg2.3 mL + 0.2 mL640 mg

V = mL

6.Hard

A vial holds 500 mg of powder. You add 3.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 250 mg. Draw up the dose: what volume V do you give?

500 mg3.8 mL + 0.2 mL250 mg

V = mL

Answer key

1. m = 10 g
2. V = 3.9 mL
3. V = 1.2 mL
4. V = 9.6 mL
5. V = 1.6 mL
6. V = 2 mL

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