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

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 = %

2.Easy

A solution is 5% w/v. You need 130 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v130 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 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. What is the concentration C in mg/mL after reconstitution?

750 mg7.2 mL+0.3 mL

C = mg/mL

5.Hard

A vial holds 1000 mg of powder. You add 4.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 680 mg. Draw up the dose: what volume V do you give?

1000 mg4.4 mL + 0.6 mL680 mg

V = mL

6.Hard

Practice exercise (made-up values, not clinical guidance). You have 100 g of 20% zinc oxide ointment. How many grams m of plain ointment base (0%) must you add to make a 10% ointment? Round to the nearest whole gram.

100 g · 20%0%10%

m = g

Answer key

1. p = 0.04 %
2. V = 2.6 mL
3. C = 100 mg/mL
4. C = 100 mg/mL
5. V = 3.4 mL
6. m = 100 g

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