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
Solution1:1 000? % w/v

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

1:1 000
p = %
2.Easy
0123455 mL

A solution is 2% w/v. You need 68 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v68 mg
V = mL
3.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.400 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 1000 mg as a powder. The practice label says to add 3.5 mL of sterile water; the powder adds 0.5 mL to the volume. The prescribed dose is 400 mg. What volume V do you draw up? Round to one decimal place.

1000 mg3.5 mL+0.5 mL400 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.76 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.76 mg
V = mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 1.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 175 mg. Draw up the dose: what volume V do you give?

500 mg1.6 mL + 0.4 mL175 mg
V = mL
6.Hard
20%chlorhexidine+0%water? mL5%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 5% 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%5%100 mL
V = mL

Answer key

  1. 1. p = 0.1 %
  2. 2. V = 3.4 mL
  3. 3. V = 1.6 mL
  4. 4. V = 7.6 mL
  5. 5. V = 0.7 mL
  6. 6. V = 75 mL

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