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
Solution1:500? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:500 as a percentage strength p (% w/v).

1:500
p = %
2.Easy
dextrose10% w/v1000 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 1000 mL of 10% w/v solution? Find m.

10% w/v1000 mL
m = g
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.68 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.68 mg
V = mL
4.Medium
ceftriaxone 1 gAdd 9.6 mL sterile water.Powder volume: 0.4 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 1000 mg as a powder. The practice label says to add 9.6 mL of sterile water; the powder adds 0.4 mL to the volume. What is the concentration C in mg/mL after reconstitution?

1000 mg9.6 mL+0.4 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 1.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 300 mg. Draw up the dose: what volume V do you give?

500 mg1.6 mL + 0.4 mL300 mg
V = mL
6.Hard
0123455 mL

A vial holds 250 mg of powder. You add 4.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 60 mg. Draw up the dose: what volume V do you give?

250 mg4.2 mL + 0.8 mL60 mg
V = mL

Answer key

  1. 1. p = 0.2 %
  2. 2. m = 100 g
  3. 3. V = 6.8 mL
  4. 4. C = 100 mg/mL
  5. 5. V = 1.2 mL
  6. 6. V = 1.2 mL

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