Adsorbent for oral administration and therapeutic agent or prophylactic agent for kidney disease and therapeutic agent or prophylactic agent for liver disease

An adsorbent for an oral administration, comprising a spherical activated carbon wherein an average particle diameter is 50 to 200 µm, a specific surface area determined by a BET method is 700 m 2 /g or more, and a bulk density is less than 0.54 g/mL is disclosed. The adsorbent for an oral administration has a high adsorbability, and is capable of adsorbing a large amount of toxins during a retention period in an intestine, and of remarkably increasing an adsorption amount of compounds having a large molecular weight.