The directions for reconstitution of oxacillin sodium for injection are on the drug label. Directions read: "For IM use, add 5.7 mL sterile water for injection. Resulting solution contains 250 mg oxacillin sodium per 1.5 mL. The vial contains oxacillin sodium equivalent to 1 gram. Usual adult dosage of oxacillin sodium is 250 mg-500 mg IM every 4 to 6 hours." The patient/client is to receive 400 mg IM every 6 hours. How many milliliters would the nurse administer?
A) 1.7
B) 2.1
C) 2.4
D) 5.7

Question

Quizplus · Accepted Answer

Refer to the directions on the label, which reads, "Add 5.7 mL of sterile water for injection. The resulting solution contains 250 mg/1.5 mL." When solving any problem, first check that the order and the supply are in the same weight measure. For this problem, no equivalent is necessary. Estimate the amount to give. Formula Method: 400 mg/250 mg *1.5 mL = 600/250 = 2.4 mL. Proportion (Ratios): 1.5 mL : 250 mg :: x mL : 400 mg; 250x = 600 mg/250 mg = 2.4 mL. Proportion (Fractions): 1.5 mL/250 mg = x mL/400 mg; 250x = 600 mg/250 mg = 2.4 mL. Dimensional Analysis: 1.5 mL/250 mg * 400 mg = 1.5 mL * 400/250 = 600 mg/250 mg = 2.4 mL.

The Directions for Reconstitution of Oxacillin Sodium for Injection Are