Objective: To describe the antiinfectious characteristics of use of (ATM) in the service of hospital of Pediatría of the Belen Hospital of Trujillo. Material and Methods: A descriptive, cross-sectional, prospective. The population sample was shaped by the medical prescriptions of the patients hospitalized in the service of pediatrics January - March of the 2007. This service counts on a total of 28 beds. Results: 184 patients and their respective clinical histories included themselves. The prevalence of the prescription of antiinfectious (PPA) was 72,28%. The average of prescription of antiinfectious by hospitalized patient was 1.5. The profile of consumption of antiinfectious based on DDP/100camas-day, by farmacológico group demonstrating to Cefalosporins (44.22%), Penicillins (32.39%) and Aminoglucosides (10.22%), with greater consumption. The proportion of antiinfectious prescribed ...