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
sodium chloride3% w/v500 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 500 mL of 3% w/v solution? Find m.

3% w/v500 mL
m = g
3.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
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.32 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.32 mg
V = mL
5.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
6.Hard
50%dextrose? mL+5%dextrose25%450 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 450 mL of 25% 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%25%450 mL
V = mL

Answer key

  1. 1. V = 3 mL
  2. 2. m = 15 g
  3. 3. C = 250 mg/mL
  4. 4. V = 3.2 mL
  5. 5. V = 500 mL
  6. 6. V = 200 mL

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