Examples · Weight-based dose (mg/kg)
Worked example
Weight-based dose (mg/kg) - practice problem 5
A patient weighs 30 kg. The prescriber orders cefazolin 75 mg/kg/day divided into 3 equal doses.
Weight30 kg
Ordered75 mg/kg/day
Safe max100 mg/kg/day
Frequency3 doses/day
How many mg is each dose?
Answer: 750 mg per dose
Step-by-step solution
1. Multiply weight by the ordered mg/kg/day
30 kg × ( 75 mg ÷ 1 kg )
= 2250 mg/day
2. Divide the daily dose into 3 equal doses
2250 mg/day ÷ 3 doses
= 750 mg per dose
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