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 1% w/v. You need 20 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v20 mg
V = mL
2.Easy
0123455 mL

A solution is 5% w/v. You need 150 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v150 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
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.8 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.8 mg
V = mL
5.Hard
90%ethanol+0%water? mL60%600 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 60% ethanol from a 90% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

90%0%60%600 mL
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 3.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 1700 mg. Draw up the dose: what volume V do you give?

2000 mg3.2 mL + 0.8 mL1700 mg
V = mL

Answer key

  1. 1. V = 2 mL
  2. 2. V = 3 mL
  3. 3. C = 100 mg/mL
  4. 4. V = 0.8 mL
  5. 5. V = 200 mL
  6. 6. V = 3.4 mL

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