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

5% w/v185 mg
V = mL
2.Easy
lidocaine1% w/v10 mL? mg

Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 10 mL of 1% w/v solution? Find m.

1% w/v10 mL
m = mg
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.52 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.52 mg
V = mL
4.Medium
cefazolin 1 gAdd 4.5 mL sterile water.Powder volume: 0.5 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains cefazolin 1000 mg as a powder. The practice label says to add 4.5 mL of sterile water; the powder adds 0.5 mL to the volume. What is the concentration C in mg/mL after reconstitution?

1000 mg4.5 mL+0.5 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 4.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 290 mg. Draw up the dose: what volume V do you give?

500 mg4.8 mL + 0.2 mL290 mg
V = mL
6.Hard
50%dextrose? mL+5%dextrose20%450 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 450 mL of 20% dextrose by mixing 50% and 5% dextrose. How many mL V of the 50% solution do you need? Round to the nearest whole mL.

50%5%20%450 mL
V = mL

Answer key

  1. 1. V = 3.7 mL
  2. 2. m = 100 mg
  3. 3. V = 5.2 mL
  4. 4. C = 200 mg/mL
  5. 5. V = 2.9 mL
  6. 6. V = 150 mL

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