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 1% w/v. You need 23 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v23 mg

V = mL

2.Easy

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:2 500 as a percentage strength p (% w/v).

1:2 500

p = %

3.Medium

A solution has a ratio strength of 1:10 000. You need 0.26 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.26 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 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

5.Hard

A vial holds 1000 mg of powder. You add 3.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 925 mg. Draw up the dose: what volume V do you give?

1000 mg3.4 mL + 0.6 mL925 mg

V = mL

6.Hard

Practice exercise (made-up values, not clinical guidance). You have 30 g of 20% zinc oxide ointment. How many grams m of plain ointment base (0%) must you add to make a 15% ointment? Round to the nearest whole gram.

30 g · 20%0%15%

m = g

Answer key

1. V = 2.3 mL
2. p = 0.04 %
3. V = 2.6 mL
4. V = 1.5 mL
5. V = 3.7 mL
6. m = 10 g

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