A prescription reads for 1 g ceftriaxone IM daily. The available vial contains ceftriaxone 500 mg/2 mL. How many mL should the nurse administer per dose?

Identify the ordered dose and available concentration Ordered Dose: 1 g (1000 mg) Available Concentration: 500 mg/2 mL Calculate the volume to administer Volume to administer = (Ordered Dose ÷ Concentration) × Volume of Concentration Volume to administer = (1000 ÷ 500) × 2 Volume to administer = 2 × 2 = 4 mL