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

2% w/v96 mg

V = mL

2.Easy

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:200 as a percentage strength p (% w/v).

1:200

p = %

3.Medium

A solution has a ratio strength of 1:1000. You need 0.11 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.11 mg

V = mL

4.Medium

A solution has a ratio strength of 1:1000. You need 0.68 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.68 mg

V = mL

5.Hard

A vial holds 500 mg of powder. You add 4.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 240 mg. Draw up the dose: what volume V do you give?

500 mg4.5 mL + 0.5 mL240 mg

V = mL

6.Hard

Practice exercise (made-up values, not clinical guidance). You have 150 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.

150 g · 20%0%15%

m = g

Answer key

1. V = 4.8 mL
2. p = 0.5 %
3. V = 0.11 mL
4. V = 0.68 mL
5. V = 2.4 mL
6. m = 50 g

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