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A member asked:
Could rapaflow (silodosin) alpha-1 blockers affect urinary sphincter or just the prostate?
A doctor has provided 1 answer
Both: Alpha blockers relax the smooth muscle component of the prostate (as opposed to the glandular part). They also relax the INTERNAL urinary sphincter at the neck of the bladder.This is why retrograde ejaculation(the ejaculate goes into the bladder instead of coming out) can occur. They do not relax the EXTERNAL sphincter(below the prostate) which controls urine voluntarily.
Answered 9/14/2020
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