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
0123455 mL

A solution is 2% w/v. You need 52 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v52 mg
V = mL
2.Easy
0123455 mL

A solution is 1% w/v. You need 27 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v27 mg
V = mL
3.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.500 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 500 mg. What volume V do you draw up? Round to one decimal place.

1000 mg3.5 mL+0.5 mL500 mg
V = mL
4.Medium
ampicillin 500 mgAdd 1.8 mL sterile water.Powder volume: 0.2 mL.300 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 500 mg as a powder. The practice label says to add 1.8 mL of sterile water; the powder adds 0.2 mL to the volume. The prescribed dose is 300 mg. What volume V do you draw up? Round to one decimal place.

500 mg1.8 mL+0.2 mL300 mg
V = mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 1.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 650 mg. Draw up the dose: what volume V do you give?

1000 mg1.5 mL + 0.5 mL650 mg
V = mL
6.Hard
70%dextrose? mL+10%dextrose25%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 25% dextrose by mixing 70% and 10% dextrose. How many mL V of the 70% solution do you need? Round to the nearest whole mL.

70%10%25%100 mL
V = mL

Answer key

  1. 1. V = 2.6 mL
  2. 2. V = 2.7 mL
  3. 3. V = 2 mL
  4. 4. V = 1.2 mL
  5. 5. V = 1.3 mL
  6. 6. V = 25 mL

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