A nurse is preparing to administer cefazolin 500 mg IM every 8 hr. Available is cefazolin 1 g vial. The package inserts instructs adding sterile water 2.5 mL to yield cefazolin 330 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Determine the total dosage: The client is prescribed 500 mg of cefazolin. Calculate the volume per dose: The cefazolin solution contains 330 mg per mL. The nurse needs to administer 500 mg per dose. To find the volume per dose: 330 mg / 1 mL = 500 mg / x mL 330x = 500 Dividing both sides by 330, we get: x = 1.515 mL Round the answer to the nearest tenth: Rounding 1.515 to the nearest tenth gives us 1.5 mL.