The present invention relates to an orally administered sustained-release triple-layer pill containing tamsulosin or a pharmaceutically acceptable salt thereof, and more particularly, to a pill that is a structurally separated triple-layer pill for releasing and absorbing medicine in the lower digestive tracts including the colon, by quickly and continuously absorbing a large quantity of water by means of a water-soluble excipient in the middle layer, without losing tamsulosin activity. Disclosed is a sustained-release triple-layer tablet for oral administration including tamsulosin or a pharmaceutically acceptable salt thereof. Specifically, the sustained-release triple-layer tablet is structurally separated and includes an intermediate layer containing a water soluble excipient to absorb a large amount of water in a rapid and continuous manner. Therefore, the formulation can release the drug in the lower digestive tract including the colon and can be absorbed by the lower digestive tract without losing the activity of tamsulosin.
