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 28 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v28 mg
V = mL
2.Easy
dextrose50% w/v20 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 20 mL of 50% w/v solution? Find m.

50% w/v20 mL
m = g
3.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.86 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.86 mg
V = mL
4.Medium
ampicillin 500 mgAdd 1.8 mL sterile water.Powder volume: 0.2 mL.? 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. What is the concentration C in mg/mL after reconstitution?

500 mg1.8 mL+0.2 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 2.1 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 400 mg. Draw up the dose: what volume V do you give?

2000 mg2.1 mL + 0.4 mL400 mg
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 1.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 175 mg. Draw up the dose: what volume V do you give?

500 mg1.8 mL + 0.2 mL175 mg
V = mL

Answer key

  1. 1. V = 2.8 mL
  2. 2. m = 10 g
  3. 3. V = 0.86 mL
  4. 4. C = 250 mg/mL
  5. 5. V = 0.5 mL
  6. 6. V = 0.7 mL

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