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 2% w/v. You need 98 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v98 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
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. What is the concentration C in mg/mL after reconstitution?

2000 mg19.2 mL+0.8 mL
C = mg/mL
4.Medium
cefuroxime 750 mgAdd 7.2 mL sterile water.Powder volume: 0.3 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 mL to the volume. What is the concentration C in mg/mL after reconstitution?

750 mg7.2 mL+0.3 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 200 mg. Draw up the dose: what volume V do you give?

1000 mg9.4 mL + 0.6 mL200 mg
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 4.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 280 mg. Draw up the dose: what volume V do you give?

1000 mg4.2 mL + 0.8 mL280 mg
V = mL

Answer key

  1. 1. V = 4.9 mL
  2. 2. m = 100 mg
  3. 3. C = 100 mg/mL
  4. 4. C = 100 mg/mL
  5. 5. V = 2 mL
  6. 6. V = 1.4 mL

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