Hello and welcome to HCM! I read your case with great attention as kidney stones produce very hard pain. The medicament being prescribed to you (tamsulosin) in essence enables the urine to pass more smoothly as it relaxes the smooth muscles of prostate and urethra in men. In women it is used for other purposes: because of its smooth muscle relaxing attributes, which may facilitate the passing of a kidney stone through the urinary tract. This medicament does not dissolve kidney stones, only facilitates their passing! There are many success stories of women who have had a benefit from using tamsulosin for this purpose. I think that your doctor prescribed this medicament correctly in trying to get rid off the stone through a non-invasive approach. However, if no progress is seen some days after taking it (up to 4-5 days) and the pain continues, then it is possible that this cure is not right for you and you probably have to consult with your doctor again on how to proceed. I hope my answer helped you! I wish you a quick recovery!