Question

The physician prescribed 500 mg of Cefizox, IM, every 12 hours for a genitourinary infection. The medication is available as a powder in a 2-gram vial. Reconstitute with 6.0 mL of sterile water for injection and shake well. Solution concentration will provide 270 mg/mL. Fluid volume will equal 7.4 mL. Use approximate quantities for dosage calculations. Give mL every 12 hours.

Answer 1

The correct volume of Cefizox to administer every 12 hours for the prescribed 500 mg dose, based on a solution concentration of 270 mg/mL and total fluid volume of 7.4 mL, is approximately 1.85 mL.

Step-by-step explanation:

The student's question involves the calculation of the correct dosage for administering Cefizox, a medication used for the treatment of a genitourinary infection. The dosage prescribed is 500 mg of Cefizox, to be given intramuscularly (IM) every 12 hours.

To prepare the medication for administration, the powder in the 2-gram vial needs to be reconstituted with 6.0 mL of sterile water, resulting in a final solution concentration that will provide 270 mg/mL and a total fluid volume of 7.4 mL.

Using these values, the required volume (in mL) that contains the prescribed dose can be calculated using the formula:

Volume to administer (mL) = (Prescribed dose in mg) / (Concentration in mg/mL)

Plugging in the values:

Volume to administer (mL) = 500 mg / 270 mg/mL = 1.85 mL (approximately)

Therefore, the correct volume to give for each dose, based on the approximate quantities for dosage calculations, is approximately 1.85 mL to be administered every 12 hours.