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 1% w/v. You need 31 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v31 mg
V = mL
2.Easy
Solution1:10 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:10 000 as a percentage strength p (% w/v).

1:10 000
p = %
3.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.65 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.65 mg
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.800 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 800 mg. What volume V do you draw up? Round to one decimal place.

2000 mg11.5 mL+1 mL800 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 75 mg. Draw up the dose: what volume V do you give?

250 mg9.2 mL + 0.8 mL75 mg
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 4.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 420 mg. Draw up the dose: what volume V do you give?

1000 mg4.6 mL + 0.4 mL420 mg
V = mL

Answer key

  1. 1. V = 3.1 mL
  2. 2. p = 0.01 %
  3. 3. V = 0.65 mL
  4. 4. V = 5 mL
  5. 5. V = 3 mL
  6. 6. V = 2.1 mL

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