The present document describes a monolithic tablet dosage form for delivery of an active ingredient at two different release rates comprising a carboxyl polymer complexed with a multivalent cation and a disintegrating agent for a first initial fast release of the active ingredient, and a modulating agent for a second sustained release of the active ingredient. Also described are processes for preparing the carboxyl polymer complexed with a multivalent cation, and carboxyl polymer made from the process.