Emergency prescription of empirical antibiotic therapy is justified in a co
ntext of febrile urinary tract infection, or to shorten the preoperative pe
riod in a hospitalised infected patient. The severity of the infection, its
origin (community or nosocomial), morphological characteristics of the bac
teria on direct examination, and urinary dip-stick data must be taken into
account to select the most appropriate antibiotic while waiting for the ant
ibiotic test results.