Please help with dosage calculation

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Hi i am reveiwing for an nclex pn exam can somebody please help me calculate the correct dosage for this question that i got from kaplan. There was an answer but i do not get the calculation.

The nurse receives an order to administer phenobarbital (luminal) gr ii PO to a 3 year old child. The label n the multi dose vial read 160 mg/ 5 cc. How many cc of phenobarbital should the nurse administer? thanks in advance!

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Specializes in PICU, Sedation/Radiology, PACU.

This is a really outdated question, but still good to know, I suppose.

gr is an abbreviation for grain. Grains are a weight-based measurement that we very rarely use in the United States. ii is the roman numeral abbreviation for 2. So gr ii = 2 grains.

For conversion purposes, one grain = 60 mg.

So your question really reads like this: The nurse receives an order to administer phenobarbital (luminal) 120 mg PO to a 3 year old child. The label n the multi dose vial read 160 mg/ 5 cc. How many cc of phenobarbital should the nurse administer?

You should be able to calculate the answer based on your standard med math formula.

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