Registered Nurse Respiratory Practice Exam 2026 – Complete Prep Guide

The most appropriate medication for a patient with pneumonia caused by a gram-positive bacterium who is allergic to Penicillin is a Macrolide. Macrolides, such as azithromycin or clarithromycin, are effective against a range of respiratory pathogens, including many gram-positive bacteria.

In cases where a patient has a documented allergy to Penicillin, it is crucial to avoid beta-lactam antibiotics, which include Penicillins and Cephalosporins, since these could potentially trigger an allergic reaction. Macrolides serve as an excellent alternative that provides coverage for typical pathogens associated with pneumonia without the risk of cross-reactivity with Penicillin allergies.

Penicillin G is not a suitable choice due to the patient's allergy to Penicillin. Furthermore, Tamiflu, which is an antiviral medication used primarily for influenza, would not be effective in treating bacterial pneumonia. Hence, Macrolides emerge as the best choice in this scenario due to their efficacy against gram-positive bacteria and their safety profile in patients with Penicillin allergies.