The present disclosure provides, am ng other things, a coated device comprising: a porous substrate a film coating at least part of the substrate, which film comprises a multilayer unit comprising a first layer and a second layer adjacent to the first layer, wherein the first layer comprises a first polymeric material and at least first interacting moiety, wherein the second layer comprises a second polymeric material and at least second interacting moiety, and wherein the interacting moieties on adjacent layers interact with one another so that the adjacent layers are associated with each other into the film and an agent for delivery associated with the coated device, such that decomposition of one or more layers of the film results in release of the agent.
