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

5% w/v185 mg
V = mL
2.Easy
benzalkonium chloride1:2 000200 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of benzalkonium chloride has a ratio strength of 1:2 000. How many milligrams m are in 200 mL?

1:2 000200 mL
m = mg
3.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
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
50%dextrose? mL+10%dextrose20%600 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 600 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%600 mL
V = mL
6.Hard
20%chlorhexidine+0%water? mL5%200 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 5% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%5%200 mL
V = mL

Answer key

  1. 1. V = 3.7 mL
  2. 2. m = 100 mg
  3. 3. C = 160 mg/mL
  4. 4. C = 250 mg/mL
  5. 5. V = 150 mL
  6. 6. V = 150 mL

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