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

5% w/v115 mg

V = mL

2.Easy

A solution is 2% w/v. You need 48 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v48 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. The prescribed dose is 600 mg. What volume V do you draw up? Round to one decimal place.

1000 mg9.6 mL+0.4 mL600 mg

V = mL

4.Medium

A solution has a ratio strength of 1:1000. You need 0.46 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.46 mg

V = mL

5.Hard

A vial holds 500 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 65 mg. Draw up the dose: what volume V do you give?

500 mg9.5 mL + 0.5 mL65 mg

V = mL

6.Hard

Practice exercise (made-up values, not clinical guidance). You have 50 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 1% ointment? Round to the nearest whole gram.

50 g · 2.5%0.5%1%

m = g

Answer key

1. V = 2.3 mL
2. V = 2.4 mL
3. V = 6 mL
4. V = 0.46 mL
5. V = 1.3 mL
6. m = 150 g

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