In various embodiments, a coated device comprises: a substrate a film coating at least part of the substrate, which film comprises a multilayer unit comprising a first layer and a second layer associated with one another via a hydrogen bond, wherein the first layer comprises a first natural polymeric material and a hydrogen bond donor and wherein the second layer comprises a second natural polymeric material and a hydrogen bond acceptor and an agent for delivery associated with the coated device. In various embodiments, a coated device comprises: a substrate a film coating at least part of the substrate, which film comprises a multilayer unit comprising a tetralayer with alternating layers of opposite charge and an agent for delivery associated with the coated device.
