INBDE Pharmacology Practice Test 2026 - Free INBDE Practice Questions and Study Guide

Endocarditis prophylaxis uses antibiotics chosen for their reliable activity against the oral streptococci that commonly cause dental-related endocarditis. The standard options include ampicillin or amoxicillin as the first-line choice, with penicillin-allergic patients receiving alternatives such as clindamycin or a macrolide (e.g., azithromycin or clarithromycin). Doxycycline is not included in these commonly recommended prophylaxis regimens, so it’s not listed as an option for this purpose. This reflects guideline consensus on which drugs reliably cover the target organisms and are appropriate for use as prophylaxis in at-risk patients.