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

0.5% w/v7.5 mg
V = mL
2.Easy
Solution1:2 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:2 000 as a percentage strength p (% w/v).

1:2 000
p = %
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.22 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.22 mg
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.? 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. What is the concentration C in mg/mL after reconstitution?

2000 mg11.5 mL+1 mL
C = mg/mL
5.Hard
50%dextrose? mL+10%dextrose20%300 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 300 mL of 20% dextrose by mixing 50% and 10% dextrose. How many mL V of the 50% solution do you need? Round to the nearest whole mL.

50%10%20%300 mL
V = mL
6.Hard
50%dextrose+10%dextrose? mL30%450 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 450 mL of 30% dextrose by mixing 50% and 10% dextrose. How many mL V of the 10% solution do you need? Round to the nearest whole mL.

50%10%30%450 mL
V = mL

Answer key

  1. 1. V = 1.5 mL
  2. 2. p = 0.05 %
  3. 3. V = 2.2 mL
  4. 4. C = 160 mg/mL
  5. 5. V = 75 mL
  6. 6. V = 225 mL

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