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 5% w/v. You need 150 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v150 mg
V = mL
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 8 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v8 mg
V = mL
3.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.2 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.2 mg
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.1600 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains oxacillin 2000 mg as a powder. The practice label says to add 11.5 mL of sterile water; the powder adds 1 mL to the volume. The prescribed dose is 1600 mg. What volume V do you draw up? Round to one decimal place.

2000 mg11.5 mL+1 mL1600 mg
V = mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 3.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 262.5 mg. Draw up the dose: what volume V do you give?

500 mg3.6 mL + 0.4 mL262.5 mg
V = mL
6.Hard
50%dextrose? mL+5%dextrose20%1500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1500 mL of 20% dextrose by mixing 50% and 5% dextrose. How many mL V of the 50% solution do you need? Round to the nearest whole mL.

50%5%20%1500 mL
V = mL

Answer key

  1. 1. V = 3 mL
  2. 2. V = 1.6 mL
  3. 3. V = 0.2 mL
  4. 4. V = 10 mL
  5. 5. V = 2.1 mL
  6. 6. V = 500 mL

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