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Question:

If gentamicin is available in 80 mg/2 ml vials, how many vials are needed to compound an IV bag containing 480 mg of gentamicin?

A 6 vials
Explaination

480 mg gentamicin x 2ml/80 mg gentamicin x 1 vial/2ml 12 ml x 1 vial/2 ml = 6 vials