Pharmaceutical formulation in the form of aqueous suspension

A pharmaceutical formulation in the form of an aqueous suspension capable of maintaining a uniform dispersion upon storage which comprises (a) 0.01-3.00 w/v % of an ion exchange resin carrying an active ingredient capable of being converted into an ionic active ingredient, (b) 0.10-3.00 w/v % of a suspending agent selected from the group consisting of natural gums, nonionic cellulose derivatives and alginates and mixtures thereof, (c) 0.05-2.00 w/v % of a dispersion stabilizer comprising an amino acid selected from the group consisting of glycine, alanine, cystine, valine, lysine, arginine, histidine and salts thereof and (d) 92.00-99.84 w/v % of water, wherein said maintained uniform dispersion is the effect of the amino acid dispersion stabilizer on the ion exchange resin carrying an active ingredient and the suspending agent.