The present invention relates to an orally administered medical adsorbent, and more specifically, to an orally administered medical adsorbent with increased strength, comprising porous activated carbon. An orally administered medical adsorbent comprising porous activated carbon by using a spherical furan resin as a carbon source, according to the present invention, can maximize the adsorption of indole, which is one among uremic toxins present in the body of a patient, and can maximize the selective adsorption for uremic toxins, on the basis of a new fact which has not been hitherto known in the relevant art.