A synthetic platelet including a biocompatible flexible nanoparticle, the nanoparticle having an outer surface and a plurality of site targeted peptides conjugated to the surface, the synthetic platelet also including a therapeutic agent, wherein the therapeutic agent is encapsulated by the nanoparticle, wherein the synthetic platelet adheres to the site targeted and promotes delivery of the therapeutic agent onto sites of the synthetic platelet adhesion, and wherein the therapeutic agent is released at the site targeted via a site-relevant enzyme.
