A client weighing 187 lbs. is prescribed polymyxin B sulfate 20,000 units/kg/day in divided doses q 12 hours. The medication available is 500,000 units/1 mL. How many mL of the medication will the nurse provide the patient for each dose?
1. 0.017 mL
2. 0.17 mL
3. 1.7 mL
4. 17 mL
3
Rationale 1: mL/dose = 1 mL/500,000 units x 20,000 units/1 kg x 1 kg/2.2 lbs x 187 lbs/day x 1 day/2 doses. Multiply the numerators and divide by the denominators. The nurse will provide the client with 1.7 mL of the medication for each dose.
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