Empiric antibiotic selection criteria for respiratory infections in pediatric practice.

BACKGROUND

Respiratory infections in children may occur as a consequence of resistant bacterial pathogens. Streptococcus pneumoniae organisms resistant to penicillin, trimethoprim/sulfamethoxazole and macrolides are increasingly prevalent. Amoxicillin- and macrolide-resistant Haemophilus influenzae and Moraxella (Branhamella) catarrhalis are also more commonly seen. Traditional agents such as amoxicillin and trimethoprim/sulfamethoxazole remain acceptable choices for most children with respiratory infections because currently most patients are not infected by resistant pathogens and there is a high spontaneous cure rate associated with these infections.

OBJECTIVE

To analyze the criteria for the selection of extended spectrum antimicrobials as empiric therapy for respiratory infections.

DISCUSSION

When an extended spectrum antimicrobial is appropriate for empiric therapy, selection should be based on: (1) efficacy; (2) adverse event profile; and (3) compliance-enhancing features (dosing with meals, once or twice daily administration, good palatability in suspension, shortened course of therapy and affordability). A new agent, ceftibuten, has recently joined other extended spectrum cephalosporins and newer macrolides (clarithromycin and azithromycin) as a choice to be considered for empiric therapy for respiratory infections. These antimicrobials are differentiated from each other and traditional agents by differences in activity in vitro against penicillin-resistant pneumococci, relative beta-lactamase stability against Gram-negative bacteria and pharmacodynamic properties. When resistant organisms are isolated or suspected in community-acquired respiratory infections, cautious use of newer antibiotics may have to be considered.