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

5% w/v170 mg
V = mL
2.Easy
lidocaine1% w/v2 mL? mg

Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 2 mL of 1% w/v solution? Find m.

1% w/v2 mL
m = mg
3.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
4.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.61 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.61 mg
V = mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 450 mg. Draw up the dose: what volume V do you give?

1000 mg9.5 mL + 0.5 mL450 mg
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 2 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 720 mg. Draw up the dose: what volume V do you give?

2000 mg2 mL + 0.5 mL720 mg
V = mL

Answer key

  1. 1. V = 3.4 mL
  2. 2. m = 20 mg
  3. 3. C = 100 mg/mL
  4. 4. V = 0.61 mL
  5. 5. V = 4.5 mL
  6. 6. V = 0.9 mL

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