IRCT2012111411469N1 IRCT 2013-02-11 Chancellor for research, Hamadan University of Medical Sciences Tamsulosin and preventing of postoperative urinary retention Clinical trial to compare the efficacy Tamsulosin and placebo in prevention of urinary retention after general anesthesia in cataract surgery 2010-07-21 anticipated 67 Complete https://irct.ir/trial/11722 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Other design features: Randomization was based on blocked simple randomization (each group was 6 patients). The study was single blind study, because physician awareness doesn't play any roll in patient's urinary retention but patient's awareness can affect the retention and patient can try to void and obscured the retention. 2 Cataract. Intervention 1: Intervention 1: Tablet Tamsulosin Hydrochloride 0.4 mg, once a day for four days, Brand name Flomax , manufacturer Farabi Pharmaceutical. Intervention 2: Intervention 2: Placebo.