The present document describes a dosage form for delivery of an activeingredient comprising: a first carboxylatedpolymer having carboxyl groups, having a degree of substitution of at least0.2, a molecular weight of at least 200 kDa, and at least30% of said carboxyl groups being complexed with a divalent cation； alone orin a co-complex with at least one of a) a control releasepolymer chosen from an insoluble polymer or a polymer having a reduced watersolubility at 30°C, and a soluble polymer； andb) a second carboxylated polymer having carboxyl groups complexed with adivalent cation. The document also describes processesof making a carboxylated polymer having carboxyl groups, having a degree ofsubstitution of at least 0.2, a molecular weight of atleast 200 kDa, and at least 30% of said carboxyl groups being complexed with adivalent cation, and an inclusion complex, a co-complex,or both comprising the same.
