The effect of green tea on treatment of uncomplicated urinary tract infection The aim of this study is to evaluate the effect of green tea on treatment of uncomplicated urinary tract infection. This study is a randomized double blind clinical trial is performed on 90 patients. the inclusion criteria are women with uncomplicated urinary tract infection that recieve cotrimaxazole concurrently and 18 to 50 years old. The exclusion criteria are pregnancy, HIV infection, diabetes and other infections. Patients divide in intervention and control group. Both of groups receive co-trimaxazole 480 mg twice daily for 3 days. In intervention group, participants receive green tea as one capsule, daily for three days. In control group one capsule of starch is given daily for three days. The urine culture and analysis is done on day 0 and 4. Patients complete a questionnaire about their urinary symptoms such as dysuria, frequent urination, suprapubic pain, and hematuria every day during this 3 days period.