Antibiotic Regimen for Dental Infections in Patients with Penicillin Allergy

Antibiotic Selection Based on Type of Allergic Reaction

For patients with immediate-type penicillin allergies, the American Dental Association recommends avoiding all penicillins and cephalosporins with similar side chains due to cross-reactivity concerns 1, 2
For non-severe, delayed-type penicillin allergies, the Infectious Diseases Society of America suggests that cephalosporins with dissimilar side chains to penicillins can be safely used if the reaction occurred >1 year ago 3, 4

The American Academy of Allergy, Asthma, and Immunology notes that cross-reactivity between penicillins and cephalosporins is primarily related to similarity of side chains, not the beta-lactam ring structure, with carbapenems having low cross-reactivity (0.87%) with penicillins 1, 2, 5
Aztreonam has no cross-reactivity with penicillins and can be safely administered to penicillin-allergic patients, according to the American College of Clinical Pharmacy 2, 5