Tamsulosin-d5 (hydrochloride) is the deuterium labeled Tamsulosin hydrochloride. Tamsulosin hydrochloride ((R)-(-)-YM12617) is an inhibitor of alpha1-adrenergic receptor. Tamsulosin hydrochloride is used for the research of prostatic hyperplasia. Tamsulosin hydrochloride attenuates abdominal aortic aneurysm growth in animal models[1].