Tamsulosin (Standard) is the analytical standard of Tamsulosin. This product is intended for research and analytical applications. Tamsulosin ((R)-(-)-YM12617 free base) is an inhibitor of alpha1-adrenergic receptor. Tamsulosin is used for the research of prostatic hyperplasia. Tamsulosin attenuates abdominal aortic aneurysm growth in animal models[1].