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

0.5% w/v9.5 mg

V = mL

2.Easy

A solution is 2% w/v. You need 22 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v22 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 1 500 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL1 500 000 units

V = mL

4.Medium

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. The prescribed dose is 1200 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1200 mg

V = mL

5.Hard

A vial holds 2000 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 960 mg. Draw up the dose: what volume V do you give?

2000 mg9.2 mL + 0.8 mL960 mg

V = mL

6.Hard

A vial holds 250 mg of powder. You add 1.9 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 140 mg. Draw up the dose: what volume V do you give?

250 mg1.9 mL + 0.6 mL140 mg

V = mL

Answer key

1. V = 1.9 mL
2. V = 1.1 mL
3. V = 1.5 mL
4. V = 12 mL
5. V = 4.8 mL
6. V = 1.4 mL

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