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

2% w/v60 mg
V = mL
2.Easy
Solution1:5 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:5 000 as a percentage strength p (% w/v).

1:5 000
p = %
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
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.84 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.84 mg
V = 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 240 mg. Draw up the dose: what volume V do you give?

1000 mg9.4 mL + 0.6 mL240 mg
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 620 mg. Draw up the dose: what volume V do you give?

2000 mg9.6 mL + 0.4 mL620 mg
V = mL

Answer key

  1. 1. V = 3 mL
  2. 2. p = 0.02 %
  3. 3. C = 100 mg/mL
  4. 4. V = 0.84 mL
  5. 5. V = 2.4 mL
  6. 6. V = 3.1 mL

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