Questions: A nurse is preparing to administer cefazolin 500 mg IM every 12 hr. Available is cefazolin injection 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.) mL

Solution Steps

• Desired dose: \( 500 \, \text{mg} \)
• Available concentration: \( 330 \, \text{mg/mL} \)

Use the formula: \[ \text{Volume (mL)} = \frac{\text{Desired dose (mg)}}{\text{Concentration (mg/mL)}} \] Substitute the given values: \[ \text{Volume (mL)} = \frac{500 \, \text{mg}}{330 \, \text{mg/mL}} \]

\[ \text{Volume (mL)} = \frac{500}{330} \approx 1.515 \, \text{mL} \]

\[ \text{Volume (mL)} \approx 1.5 \, \text{mL} \]

Final Answer