RN HESI Dosage Calculations II Proctored Exam
Calculation
A client receives a prescription for warfarin 2 mg IM daily. The pharmacy delivers a vial labeled, warfarin 5 mg/single-use vial. The instructions read, reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL. How many mg should the nurse administer? (Enter the numerical value only.)
mg
Explanation & Rationale
Volume (mL) = Dose (mg) / Concentration (mg/mL) Substituting the values, the nurse gets: Volume (mL) = 2 mg / 2 mg/mL Volume (mL) = 1 mL Therefore, the nurse should administer 1 mL of the reconstituted solution to deliver 2 mg of warfarin to the client.
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