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
? × 0.5 mg

The prescription is 1000 micrograms (mcg) of a drug. The tablets contain 0.5 mg each. How many tablets n do you give?

1000 mcg0.5 mg/tablet
n = tablets
2.Easy
? × 500 mg

A patient is prescribed 1250 mg of a drug. The tablets on the ward contain 500 mg each. How many tablets n do you give? The tablets are scored, so they can be broken in half.

1250 mg500 mg/tablet
n = tablets
3.Medium
500 mg+ 1.8 mLV = ? mL

A vial contains 500 mg of powder. The label says: add 1.8 mL of water for injection to give a total volume of 2 mL. The prescription is 375 mg. What volume V of the reconstituted solution do you give?

500 mg+ 1.8 mL → 2 mL375 mg
V = mL
4.Medium
024681010 mL

A child weighing 20 kg is prescribed 7.5 mg/kg of a drug. The stock solution contains 50 mg/mL. Draw up the dose: what volume V do you give?

20 kg7.5 mg/kg50 mg/mL
V = mL
5.Hard
20%stockwater = ? mL

You must prepare 250 mL of a 2% (w/v) solution from a 20% (w/v) stock solution. How much water W must be added to the stock?

C₁ = 20%C₂ = 2%V₂ = 250 mL
W = mL
6.Hard
102 kg189 cmBSA = √(h·w/3600)135 mg/m²D = ? mg

A patient is 189 cm tall and weighs 102 kg. The prescription is 135 mg/m². Using the Mosteller formula BSA = √(height (cm) × weight (kg)/3600), find the dose D in mg.

189 cm102 kg135 mg/m²
D = mg

Answer key

  1. 1. n = 2 tablets
  2. 2. n = 2.5 tablets
  3. 3. V = 1.5 mL
  4. 4. V = 3 mL
  5. 5. W = 225 mL
  6. 6. D = 312.4 mg

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