Efficacy of selective α1A adrenoceptor antagonist silodosin in the medical expulsive therapy for ureteral stones

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Abstract

<jats:title>Abstract</jats:title><jats:p>Recently, we reported that α1A adrenoceptor (AR) is the main participant in phenylephrine‐induced human ureteral contraction. We therefore decided to carry out a prospective randomized study to evaluate the effects of silodosin, a selective α1A AR antagonist, as a medical expulsive therapy for ureteral stones. A total of 187 male patients, who were referred to our department for the management of symptomatic unilateral ureteral calculi of less than 10 mm, were randomly divided into two groups: group A (92 patients), who were instructed to drink 2 L of water daily, and group B (95 patients), who received the same instruction and were also given silodosin (8 mg/daily) for a maximum of 8 weeks. Expulsion rate, mean expulsion time and need for analgesics were examined. Overall, the mean expulsion time was 15.19 ± 7.14 days for group A and 10.27 ± 8.35 days for group B (<jats:italic>P</jats:italic> = 0.0058). In cases involving distal ureteral stones, the mean expulsion time was 13.40 ± 5.90 and 9.29 ± 5.91 days, respectively (<jats:italic>P</jats:italic> = 0.012). For stones of 1–5 mm in diameter, the mean expulsion time was 14.28 ± 6.35 and 9.56 ± 8.45 days, respectively (<jats:italic>P</jats:italic> = 0.017). For stones of 6–9 mm in diameter, the stone expulsion rate was 30.4% and 52.2% (<jats:italic>P</jats:italic> = 0.036), and the mean expulsion time was 21.00 ± 9.9 and 11.33 ± 8.31 days, respectively (<jats:italic>P</jats:italic> = 0.038). Herein, we report the first on silodosin in the management of ureteral lithiasis. Our findings suggest that silodosin might have potential as a medical expulsive therapy for ureteral stones.</jats:p>

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