Basic Drug Calculations: Problem 11

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.

What rate (gtts/min) will you infuse the medication in question 9?

  9ml over 10 min with 60 gtts/min administratin set

  9 ml     X  60 gtts   =    540 gtts  =  54 gtts/min
 10 min         ml              10 min

    9ml over 20 min with 60 gtts/min administratin set

  9 ml     X  60 gtts   =    540 gtts  =  27 gtts/min
 20 min         ml              20 min

Answer: 27 - 54 gtts/min

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