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 5% w/v. You need 60 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v60 mg

V = mL

2.Easy

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:10 000 as a percentage strength p (% w/v).

1:10 000

p = %

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 0.91 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.91 mg

V = mL

5.Hard

Practice exercise (made-up values, not clinical guidance). You must prepare 750 mL of 30% dextrose by mixing 50% and 10% dextrose. How many mL V of the 10% solution do you need? Round to the nearest whole mL.

50%10%30%750 mL

V = mL

6.Hard

A vial holds 2000 mg of powder. You add 1.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 1100 mg. Draw up the dose: what volume V do you give?

2000 mg1.8 mL + 0.2 mL1100 mg

V = mL

Answer key

1. V = 1.2 mL
2. p = 0.01 %
3. V = 4.8 mL
4. V = 0.91 mL
5. V = 375 mL
6. V = 1.1 mL

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