A bioerodible composition for delivery of a bioactive agent is the reaction product of a reaction mixture which includes an oxidized dextran solution, and a mixture of solids containing a dihydrazide, a bioactive agent, and optionally a pH adjusting agent in an amount sufficient to achieve a pH of the reaction mixture of 6 or less. The composition may include a release agent for the controlled release of the bioactive agent from the composition. The composition may be administered to a body site in need of the same by providing a first aliquot portion of a reaction mixture which includes the reactants and a bioactive agent. A kit which includes a double syringe respectively containing the first and second aliquot portions of the reaction mixture may be provided so that the same may be mixed just prior to use.
