The present invention addresses the problem of providing a novel formulation for which constraints on patient administration have been relaxed compared to previous spherical carbon adsorbents, allowing said formulation to be administered simultaneously with other agents and at a reduced dose. This problem can be solved with an orally administered formulation that includes a porous material, wherein the porous material is provided with a means for first exposing the surface of the porous material in the large intestine or the lower small intestine.本發明之課題係提供緩和以往之球形吸附碳的患者服藥上的限制，與其他藥劑同時服用為可能，且用量亦被減少之新穎製劑。前述課題係一種包含多孔質材料的經口投予用製劑，可藉由對多孔質材料施以使多孔質材料的表面於大腸或小腸下部才開始露出的手段的製劑而解決。
