Comparing the Efficacy of Tamsulosin and Silodosin in the Medical Expulsion Therapy for Ureteral Calculi

Abstract

Urolithiasis is a chronic disease of mankind, which has enormous public health importance and it accounts for a substantial economic burden on our society. Hence, it becomes all the more important to formulate cheaper and easier means for treating this condition. The past few years have seen a number of drugs being introduced and successfully used in the medical expulsion therapy of small, uncomplicated ureteral calculi, with each drug claiming to provide better results than the others. Ours is perhaps the first study which has compared the efficacy of tamsulosin and silodosin in the medical expulsion therapy for ureteral calculi. To compare the efficacy of tamsulosin (0.4mg) vs silodosin (8mg), both in terms of the stone expulsion rate and the time to stone expulsion. A prospective and a randomized controlled study was conducted in the Department of Urology, Regional Institute of Medical Sciences (RIMS), Imphal, Manipur, India. From February to August 2012, 100 patients who were between the age group of 18-50 years, who had unilateral, uncomplicated middle or lower ureteral stones </= 1cm were enrolled and they were divided into two groups. Group 1 received tamsulosin (0.4mg) daily, whereas Group 2 received silodosin (8mg) daily for a maximum period of 4 weeks. The patients were followed up weekly or biweekly with imaging studies. The primary endpoint was the stone expulsion rate and the secondary endpoints were the stone expulsion time, the rate of the interventions and the side effects. The statistical analysis was performed by using the Student's t-test and the Chi-squared test. A p value of < 0.05 was considered to be statistically significant. The SPSS-16 software was used for the statistical analysis of the data. A spontaneous stone expulsion was observed in 58% of the patients in group 1 and in 82% of the patients in Group 2, which was statistically significant. There was also a significant difference between the groups with regards to the mean stone expulsion time. A lower analgesic use was found in Group 2. In our study, silodosin was found to be clinically superior to tamsulosin, both in terms of the stone expulsion rate and the stone expulsion time.