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 0.5% w/v. You need 6.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v6.5 mg

V = mL

2.Easy

A solution is 1% w/v. You need 29 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v29 mg

V = mL

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 18.2 mL of diluent. The prescribed dose is 1 200 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL1 200 000 units

V = mL

4.Medium

A solution has a ratio strength of 1:1000. You need 0.42 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.42 mg

V = mL

5.Hard

Practice exercise (made-up values, not clinical guidance). You have 20 g of 10% salicylic acid ointment. How many grams m of 2% salicylic acid ointment must you add to make a 4% ointment? Round to the nearest whole gram.

20 g · 10%2%4%

m = g

6.Hard

Practice exercise (made-up values, not clinical guidance). You have 60 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.

60 g · 20%0%15%

m = g

Answer key

1. V = 1.3 mL
2. V = 2.9 mL
3. V = 4.8 mL
4. V = 0.42 mL
5. m = 60 g
6. m = 20 g

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