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

2% w/v94 mg

V = mL

2.Easy

Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 20 mL of 1% w/v solution? Find m.

1% w/v20 mL

m = mg

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 600 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL600 000 units

V = mL

4.Medium

A solution has a ratio strength of 1:10 000. You need 0.3 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.3 mg

V = mL

5.Hard

A vial holds 1000 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 90 mg. Draw up the dose: what volume V do you give?

1000 mg9.2 mL + 0.8 mL90 mg

V = mL

6.Hard

A vial holds 2000 mg of powder. You add 3.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 1400 mg. Draw up the dose: what volume V do you give?

2000 mg3.4 mL + 0.6 mL1400 mg

V = mL

Answer key

1. V = 4.7 mL
2. m = 200 mg
3. V = 0.6 mL
4. V = 3 mL
5. V = 0.9 mL
6. V = 2.8 mL

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