The healthcare provider orders Ceftriaxone 20 mg IV every 6 hours. The instructions say to reconstitute 10 mg of Ceftriaxone with 6.5 ml of normal saline for a final concentration of 5 mg/ml. How many mL would the nurse administer?

The correct answer is option C: 3.33 mL. To calculate the amount to administer, we first find the total dose required every 6 hours (20 mg). Since the concentration is 5 mg/ml, the nurse would administer 4 ml (20 mg / 5 mg/ml) every 6 hours. Therefore, to find the amount for each dose, we divide 4 ml by 4 (total doses in 24 hours). Thus, the nurse would administer 1 ml (4 ml / 4) every 6 hours.