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

0.5% w/v9 mg

V = mL

2.Easy

A solution is 2% w/v. You need 12 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v12 mg

V = mL

3.Medium

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 1000 mg as a powder. The practice label says to add 9.6 mL of sterile water; the powder adds 0.4 mL to the volume. What is the concentration C in mg/mL after reconstitution?

1000 mg9.6 mL+0.4 mL

C = mg/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 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

5.Hard

A vial holds 2000 mg of powder. You add 4.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 1040 mg. Draw up the dose: what volume V do you give?

2000 mg4.2 mL + 0.8 mL1040 mg

V = mL

6.Hard

A vial holds 250 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 105 mg. Draw up the dose: what volume V do you give?

250 mg9.4 mL + 0.6 mL105 mg

V = mL

Answer key

1. V = 1.8 mL
2. V = 0.6 mL
3. C = 100 mg/mL
4. V = 1.2 mL
5. V = 2.6 mL
6. V = 4.2 mL

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