Smooth muscle relax: Tamsulosin ("flomax") is an alpha-blocker/smooth muscle relaxant used to open the prostatic urethra/bladder neck to facilitate voiding. Since there is similar muscle in the ureteral wall, "relaxation" should open the ureteral lumen and increase the spontaneous passage of small stones.
Answered 4/11/2014
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Ureter: Because it causes the smooth muscle of the ureter to relax,making it easier for stone to pass if it is not too big.
Answered 5/24/2019
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