| abstract |
An object of the present invention is to provide a hyperphosphatemia therapeutic agent and particles capable of sufficiently reducing serum phosphorus concentration and having a low dose. According to the present invention, it is a hyperphosphatemia therapeutic agent comprising, as an active ingredient, particles containing a crosslinked polymer having a substituent having an NR A1 R A2 structure or a salt thereof, wherein the particles have an average particle diameter of 20 A hyperphosphatemia therapeutic agent having a particle size of 150 to 150 μm and a swelling ratio of the above particles of 9 to 16 mL / g (however, R A1 and R A2 each independently represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms , An aminoalkyl group having 1 to 20 carbon atoms, a salt thereof and the like are provided. |