This study is a clinical trial which performs in emergency department of Imam Khomeini hospital in Sari.
All patients are under urinary catheter. After that they were explained about doing this research, written informed consent will be taken from them to enter into the study .and then, the samples are divided into two groups of 38 members. The first group received 0/4 mg of Tamsulosin Capsule from Modava daroo Company; it is given once a day at bed time. The second group received 0/4 mg of Tamsulosin hydrochloride along with Isosorbide dinitrate slow release by 20 mg every 12 hours and then the patient discharge from the Emergency department by doing urine and kidney function tests. After 72 hours of taking medication, the patients are reexamined again and their urinary catheter is removed, and the ability to urinate without a catheter is evaluated and weekly follow up will continue for a month and prostate volume verified by transrectal ultrasonography, and reuse of these patients to urinary catheter is checked. All patients 's information will be by the executive through track information which includes First and last name , Case number, Admission date , underlying disease , consumable drudges , Sonographic finding, Prostate volume, Urea, Creatine , Urine test, distended bladder, hypogasteric pain, urination feel, Age, the amount of urine discharged , will be gathered .