Final answer:
To prepare Marcus's IV bag, the pharmacy would need to add 5 mL of Azithromycin 100 MG/ML Injectable Solution into the sodium chloride bag to reach a total dose of 500 mg.
Step-by-step explanation:
The subject of the question is Medicine, related to pharmacology and dosage calculations. Marcus has a prescription for Azithromycin 500mg to be administered in 500 mL of sodium chloride. Since Azithromycin is available in a 100 MG/ML Injectable Solution, the pharmacy would need to determine the correct volume to withdraw from this solution to add to the sodium chloride to achieve a total dose of 500 mg.
To calculate this, we use the dosage concentration formula:
Volume (mL) = Dose (mg) ÷ Concentration (mg/mL)
In this case:
Volume (mL) = 500 mg ÷ 100 mg/mL
Volume (mL) = 5 mL
The pharmacy would need to add 5 mL of the Azithromycin solution to the bag.