Tamsulosin is used in the treatment of Benign prostatic hyperplasia. View Tamsulosin ’s uses, side-effects, drug interactions, expert advice and user FAQs only on 1mg .com. Tamsulosin is used for benign prostatic hyperplasia and to help with the passage of kidney stones. [8][14] Tamsulosin , however, appears to be effective only for stones over 4 mm and less than 10 mm in size. Tamsulosin is an alpha-1A and alpha-1B adrenergic receptor antagonist used to treat benign prostatic hyperplasia, ureteral stones, prostatitis, and female voiding dysfunction. Tamsulosin is an alpha blocker that relaxes the prostate and bladder muscles to treat BPH symptoms in men. Learn about its warnings, interactions, and how to take it safely.