Macrolides in dentistry are used as an alternative to penicillin and cephalosporins in patients with which condition?

• A. Beta-lactam allergy
• B. Asthma
• C. Gum disease only
• D. Viral infections

Answer: (A)

Macrolides are used in dentistry as an alternative to penicillin and cephalosporins when the patient has a beta-lactam allergy. The beta-lactam antibiotics (penicillins and cephalosporins) share a structural ring that can trigger allergic reactions in some people, so choosing a drug from a different class avoids that risk. Macrolides, such as erythromycin, azithromycin, and clarithromycin, do not contain the beta-lactam ring and work by inhibiting bacterial protein synthesis, making them effective against many common oral bacteria. This makes them a suitable option for prophylaxis or treatment in patients known to be allergic to beta-lactams. They aren’t used for viral infections, and antibiotic choice isn’t driven by asthma or gum disease alone.