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

2% w/v78 mg

V = mL

2.Easy

A solution is 2% w/v. You need 38 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v38 mg

V = mL

3.Medium

Practice exercise (made-up values, not clinical guidance). A vial contains cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 mL to the volume. The prescribed dose is 600 mg. What volume V do you draw up? Round to one decimal place.

750 mg7.2 mL+0.3 mL600 mg

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

3.2 mL → 1 000 000 units/mL750 000 units

V = mL

5.Hard

A vial holds 250 mg of powder. You add 4.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 150 mg. Draw up the dose: what volume V do you give?

250 mg4.8 mL + 0.2 mL150 mg

V = mL

6.Hard

Practice exercise (made-up values, not clinical guidance). You must prepare 900 mL of 4% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%4%900 mL

V = mL

Answer key

1. V = 3.9 mL
2. V = 1.9 mL
3. V = 6 mL
4. V = 0.8 mL
5. V = 3 mL
6. V = 720 mL

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