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 0.5% w/v. You need 13 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v13 mg
V = mL
2.Easy
dextrose50% w/v50 mL? g

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

50% w/v50 mL
m = g
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.18 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.18 mg
V = mL
4.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.? 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. What is the concentration C in mg/mL after reconstitution?

1000 mg3.5 mL+0.5 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 3.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 725 mg. Draw up the dose: what volume V do you give?

1000 mg3.5 mL + 0.5 mL725 mg
V = mL
6.Hard
23%sodium chloride? mL+3%sodium chloride8%1500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1500 mL of 8% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.

23%3%8%1500 mL
V = mL

Answer key

  1. 1. V = 2.6 mL
  2. 2. m = 25 g
  3. 3. V = 1.8 mL
  4. 4. C = 250 mg/mL
  5. 5. V = 2.9 mL
  6. 6. V = 375 mL

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