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

2% w/v50 mg
V = mL
2.Easy
0123455 mL

A solution is 5% w/v. You need 165 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v165 mg
V = mL
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
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.1200 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. The prescribed dose is 1200 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1200 mg
V = mL
5.Hard
20%20 g+0%base? g10%zinc oxide

Practice exercise (made-up values, not clinical guidance). You have 20 g of 20% zinc oxide ointment. How many grams m of plain ointment base (0%) must you add to make a 10% ointment? Round to the nearest whole gram.

20 g · 20%0%10%
m = g
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 1.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 250 mg. Draw up the dose: what volume V do you give?

1000 mg1.6 mL + 0.4 mL250 mg
V = mL

Answer key

  1. 1. V = 2.5 mL
  2. 2. V = 3.3 mL
  3. 3. C = 100 mg/mL
  4. 4. V = 12 mL
  5. 5. m = 20 g
  6. 6. V = 0.5 mL

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