1.Easy
A patient is prescribed 500 mg of a drug 2 times a day for 10 days. The tablets contain 250 mg each. How many tablets N are needed for the whole course?
500 mg2× per day10 days250 mg/tablet
N = tablets
Dosage calculations worksheet with answers
2.Easy
The prescription is 22 mg. The stock solution contains 10 mg in 1 mL. Draw up the dose in the syringe: what volume V do you give?
22 mg10 mg/1 mL
V = mL
3.Medium
A vial contains 500 mg of powder. The label says: add 9.6 mL of water for injection to give a total volume of 10 mL. The prescription is 50 mg. What volume V of the reconstituted solution do you give?
500 mg+ 9.6 mL → 10 mL50 mg
V = mL
4.Medium
A child weighing 10 kg is prescribed 4 mg/kg of a drug. The stock solution contains 20 mg/mL. Draw up the dose: what volume V do you give?
10 kg4 mg/kg20 mg/mL
V = mL
5.Hard
The prescription is 1150 units of a drug that comes as 5000 units/mL. Draw up the dose in the 1 mL syringe: what volume V do you give?
1150 units5000 units/mL
V = mL
6.Hard
The prescription is 6100 units of a drug that comes as 10000 units/mL. Draw up the dose in the 1 mL syringe: what volume V do you give?
6100 units10000 units/mL
V = mL
Answer key
- 1. N = 40 tablets
- 2. V = 2.2 mL
- 3. V = 1 mL
- 4. V = 2 mL
- 5. V = 0.23 mL
- 6. V = 0.61 mL
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