Dosage calculations worksheet with answers

Free printable Dosage 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
? × 5 mg

A patient is prescribed 5 mg of a drug 4 times a day for 10 days. The tablets contain 5 mg each. How many tablets N are needed for the whole course?

5 mg4× per day10 days5 mg/tablet
N = tablets
2.Easy
0123455 mL

The prescription is 156 mg. The stock solution contains 200 mg in 5 mL. Draw up the dose in the syringe: what volume V do you give?

156 mg200 mg/5 mL
V = mL
3.Medium
45 kg2 mg/kgD = ? mg

A patient weighs 45 kg and is prescribed 2 mg/kg as a single dose. Find the dose D in mg.

45 kg2 mg/kg
D = mg
4.Medium
22 kg5 mg/kgD = ? mg

A patient weighs 22 kg and is prescribed 5 mg/kg as a single dose. Find the dose D in mg.

22 kg5 mg/kg
D = mg
5.Hard
20k units1000 mL? mL/h1500 units/h

An infusion contains 20000 units of a drug in 1000 mL. The prescription is 1500 units per hour. At what rate R do you set the pump, in mL/h?

20000 units/1000 mL1500 units/h
R = mL/h
6.Hard
25%stockwater = ? mL

You must prepare 1000 mL of a 2.5% (w/v) solution from a 25% (w/v) stock solution. How much water W must be added to the stock?

C₁ = 25%C₂ = 2.5%V₂ = 1000 mL
W = mL

Answer key

  1. 1. N = 40 tablets
  2. 2. V = 3.9 mL
  3. 3. D = 90 mg
  4. 4. D = 110 mg
  5. 5. R = 75 mL/h
  6. 6. W = 900 mL

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