A female patient is questioning the nurse on why she can’t explain the same 5-day antibiotic (Zithromax) that her husband received. The patient is 65 with a history of and has an abnormal heart rhythm. The nurse explains that:

Choice A reason is that Zithromax (azithromycin) is not linked to cancer in women; this is inaccurate. QT prolongation is a known risk, especially in elderly patients with cardiac issues, so this is incorrect. Choice B reason: Azithromycin can prolong the QT interval, risking arrhythmias, particularly in older women with heart rhythm issues. This explains the different prescribing, making it the correct choice. Choice C reason: Zithromax’s effectiveness is not gender-specific; efficacy depends on the infection, not sex. The cardiac risk is the concern, so this is incorrect for the explanation. Choice D reason: Cost or insurance is irrelevant to the medical decision. QT prolongation risk in this patient’s profile drives the choice, so this is incorrect.