The present invention provides compositions and methods for increasing absorption of poorly absorbable antibiotics, particularly third generation cephalosporin antibiotics, in oral dosage solid and/or suspension forms. Specifically, the composition is comprised of a biopolymer that is preferably swellable and/or mucoadhesive, a poorly absorbable antibiotic, and a cationic binding agent contained within the biopolymer such that the binding agent is tonically bound or complexed to at least one member selected from the group consisting of the biopolymer and the antibiotic.