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 2% w/v. You need 34 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v34 mg

V = mL

2.Easy

A solution is 2% w/v. You need 60 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v60 mg

V = mL

3.Medium

Practice exercise (made-up values, not clinical guidance). A vial contains cefazolin 1000 mg as a powder. The practice label says to add 4.5 mL of sterile water; the powder adds 0.5 mL to the volume. What is the concentration C in mg/mL after reconstitution?

1000 mg4.5 mL+0.5 mL

C = mg/mL

4.Medium

A solution has a ratio strength of 1:1000. You need 0.19 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.19 mg

V = mL

5.Hard

Practice exercise (made-up values, not clinical guidance). You must prepare 300 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%300 mL

V = mL

6.Hard

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 4% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%4%600 mL

V = mL

Answer key

1. V = 1.7 mL
2. V = 3 mL
3. C = 200 mg/mL
4. V = 0.19 mL
5. V = 150 mL
6. V = 480 mL

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