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). How many mg of lidocaine are in 5 mL of 2% w/v solution? Find m.

2% w/v5 mL

m = mg

2.Easy

A solution is 2% w/v. You need 64 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v64 mg

V = mL

3.Medium

A solution has a ratio strength of 1:1000. You need 0.41 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.41 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 18.2 mL of diluent. The prescribed dose is 400 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL400 000 units

V = mL

5.Hard

Practice exercise (made-up values, not clinical guidance). You must prepare 1500 mL of 13% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.

23%3%13%1500 mL

V = mL

6.Hard

Practice exercise (made-up values, not clinical guidance). You have 120 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.

120 g · 20%0%10%

m = g

Answer key

1. m = 100 mg
2. V = 3.2 mL
3. V = 0.41 mL
4. V = 1.6 mL
5. V = 750 mL
6. m = 120 g

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