Background & Objectives:�Urinary tract infection (UTI) ranges from asymptomatic bacteriuria to severe renal infection with sepsis. Urinary tract infection can cause many complications as abscess, hypertension, renal failure, renal scar, reflux and so on. Since there is no general agreement on the administration of additional fluid (1.5 times maintenance) on the early treatment of UTI on this study was conducted to see the effect of additional fluid. 

Methods:�206 children with UTI who were admitted in Amir Kabir Hospital of Arak from March 2005 to March 2006, were divided into two groups of 103. One group received the usual amount of maintenance fluid and the other 1.5 times of maintenance. The course of resolution of dysuria, frequency, malodorous urine, abdominal pain and fever were compared in the two groups. Patients' urine culture was performed on the second day, 7-10 days, and 90 days after admission. Patients were matched according to their age and sex. Those who presented with azotemia were excluded from the study.

Results: Receiving additional fluid had a significant effect on the malodorous urine dysuria. However, it had an inverse effect on the treatment of fever and urinary frequency and it made them even last longer. In other areas like abdominal pain and urine culture in 3 stages there was no difference.

Conclusion: It seems that intake of excessive amounts of water has no significant effect on the results of the UTI treatment.