Azithromycin suspension is available at 100 mg/5 mL and 200 mg/5 mL concentrations. A physician orders 150 mg to be given on the first day, and 75 mg to be given on days 2 through 5. How should this medication be administered?
7.5 mL of the 200 mg/5 mL suspension on day 1 and 3.7 mL on days 2 through 5.
To administer the prescribed dosages of azithromycin, the 200 mg/5 mL suspension is the appropriate choice, allowing for accurate measurement of the required 150 mg on day 1 and 75 mg on subsequent days.
This option is incorrect because 3.7 mL of the 100 mg/5 mL suspension provides only 74 mg (3.7 mL x 20 mg/mL), which is insufficient for the required 150 mg on day 1. Additionally, 1.8 mL of this suspension only yields 36 mg (1.8 mL x 20 mg/mL), which is also less than the required 75 mg for days 2 through 5.
While 3.7 mL of the 200 mg/5 mL suspension does provide the correct amount of 150 mg on day 1, the 1.8 mL dosage for days 2 through 5 results in only 72 mg (1.8 mL x 20 mg/mL), which does not meet the 75 mg requirement.
This choice is incorrect because 5.0 mL of the 100 mg/5 mL suspension equals 100 mg (5.0 mL x 20 mg/mL), which is not adequate for the 150 mg needed on day 1. Furthermore, 2.5 mL would provide only 50 mg (2.5 mL x 20 mg/mL) on subsequent days, well below the 75 mg requirement.
This option correctly administers 150 mg on day 1, as 7.5 mL of the 200 mg/5 mL suspension equals 300 mg (7.5 mL x 40 mg/mL), while the 3.7 mL on days 2 through 5 provides 74 mg (3.7 mL x 20 mg/mL), which
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