How long will it take for flomax (tamsulosin) to begin helping my bph?

2 days: Most men will see an improvement in their voiding symptoms in just a day or two but may see more improvement over several weeks.

Just a day or two: Alph blockers like Flomax work very quickly to improve urinary symptoms. Most patients see a abenefit within a few days, but there are some patients who may have improvement after just one dose. Rapaflo and uroxatral (alfuzosin) have both been shown to work within hours. If the sypmtoms do not improve within a week or two, then a different course of treatment or re-evaluation should be considered.