Basic Drug Calculations: Problem 9

  1. Ordered:  Nafcillin 900 mg IVPB q6h for a 27 kg child.   Available:  Dry powder in 1 g vials.   Admin.. set:  60 gtts/ml.  The vial states to reconstitute with 3.4 ml diluent to produce 1g/4 ml with concentration of 250 mg/ml. The medication book recommends giving a concentration of 100 mg/ml, duration of infusion 10-20 minutes.

How many milliliters of the reconstituted medication will you draw up for each dose? 

 250 mg : 1 ml ::  900 mg : x

 250 x = 900

 x = 900/250    =  3.6 ml

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