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
? × 12.5 mg

A patient is prescribed 37.5 mg of a drug. The tablets on the ward contain 12.5 mg each. How many tablets n do you give?

37.5 mg12.5 mg/tablet
n = tablets
2.Easy
? × 25 mg

A patient is prescribed 62.5 mg of a drug. The tablets on the ward contain 25 mg each. How many tablets n do you give? The tablets are scored, so they can be broken in half.

62.5 mg25 mg/tablet
n = tablets
3.Medium
500 mg+ 4.6 mLV = ? mL

A vial contains 500 mg of powder. The label says: add 4.6 mL of water for injection to give a total volume of 5 mL. The prescription is 300 mg. What volume V of the reconstituted solution do you give?

500 mg+ 4.6 mL → 5 mL300 mg
V = mL
4.Medium
024681010 mL

A child weighing 20 kg is prescribed 5 mg/kg of a drug. The stock solution contains 25 mg/mL. Draw up the dose: what volume V do you give?

20 kg5 mg/kg25 mg/mL
V = mL
5.Hard
25%stockV₁ = ? mL

You must prepare 100 mL of a 2.5% (w/v) solution from a 25% (w/v) stock solution. What volume of stock V₁ do you need?

C₁ = 25%C₂ = 2.5%V₂ = 100 mL
V₁ = mL
6.Hard
100 mg/5 mLV = ? mL

A child weighing 20 kg is prescribed 20 mg/kg per dose of an oral suspension that contains 100 mg in 5 mL. What volume V do you give?

20 kg20 mg/kg100 mg/5 mL
V = mL

Answer key

  1. 1. n = 3 tablets
  2. 2. n = 2.5 tablets
  3. 3. V = 3 mL
  4. 4. V = 4 mL
  5. 5. V₁ = 10 mL
  6. 6. V = 20 mL

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