An adsorbent for oral administration characterized by comprising a spherical active carbon which is produced with the use of a thermosetting resin as a carbon source and has a diameter of from 0.01 to 1 mm and a specific surface area determined in accordance with Langmuir's adsorption equation of 1000 m2/g or more. An adsorbent for oral administration characterized by comprising a surface-modified spherical active carbon which is produced with the use of a thermosetting resin as a carbon source and has a diameter of from 0.01 to 1 mm and a specific surface area determined in accordance with Langmuir's adsorption equation of 1000 m2/g or more and carries 0.40 to 1.00 meq/g of acidic groups in total and 0.40 to 1.10 meq/g of basic groups in total. These adsorbents for oral administration scarcely adsorb useful components in vivo and have favorable performance of adsorbing toxic substances, i.e., showing advantageous selective adsorption properties.
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