Acute bronchitis: results of U.S. and European trials of antibiotic therapy.

Acute bronchitis, an illness frequently encountered by primary-care physicians, is an inflammation of the tracheobronchial tree that results from a respiratory tract infection. It is characterized by persistent cough and sputum production and is occasionally accompanied by fever and/or chest pain. Acute bronchitis may have a viral or bacterial origin and is often treated with antibiotics. Four clinical trials were conducted to compare high and low doses of loracarbef, a new oral beta-lactam antibiotic, with three agents commonly used to treat acute bronchitis: amoxicillin/clavulanate, cefaclor, and amoxicillin. Results of these studies indicated that loracarbef, 400 and 200 mg twice daily, had clinical and bacteriologic efficacy against the common respiratory pathogens Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella (Branhamella) catarrhalis that was comparable with that of the comparative agents. Loracarbef was as well tolerated as cefaclor and amoxicillin; moreover, it produced a significantly lower incidence of diarrhea than did amoxicillin/clavulanate. Loracarbef may be considered a safe and effective alternative agent for the treatment of patients with acute bronchitis.