A prescription call for erythromycin 400/5ml,dispense 100ml,the dose is 40mg/kg/day and the child weigh 44?

pounds.the sig reads----tsp qid until gone.What would the tsp dose be?how many days will the prescription last
thank you
Answers:
44lbs * (1kg/2.2lbs) = 20kg

20kg * 40mg/kg/day = 800mg/day

800mg/day * 1day/4doses = 200mg/dose (qid=4 times a day)

400mg/5ml = 200mg/xml
x=2.5ml (1/2 tsp)

10ml/day :: 100ml = 10 days

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