A nurse is preparing to administer cefazolin 250 n IM to a client. Available is cefazolin powder for injection 500 mg vial. The nurse reconstitutes the powder with 2 mL of sterile water for a concentration of 225 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Determine the desired dosage: The nurse needs to administer 250 mg of cefazolin. Determine the volume per dose: The concentration of the reconstituted cefazolin solution is 225 mg/mL. The nurse needs to administer 250 mg per dose. To find the volume per dose: 225 mg / 1 mL = 250 mg / x mL Cross-multiplying gives us: 225x = 250 Dividing both sides by 225, we get: x = 1.111 mL Round the answer to the nearest tenth: Rounding 1.111 to the nearest tenth gives us 1.1 mL.