Abstract: Manufacture of nanoparticles on the basis of methyl vinyl ether and maleic acid for the administration of pharmaceuticals of an hydrophilic nature, in particular analogs of puric and pyrimidinic bases. The nanoparticles are obtained by desolvation with an hydroalcoholic phase of a methyl vinyl ether and maleic acid copolymer solution in acetone. The particles obtained are next treated with cross-linking agents (diamines or proteins) for the purpose of prolonging their useful life and are, possibly, incubated with a pharmaceutical which will be transported on the surface. The nanoparticles can carry the pharmaceutical likewise encapsulated which would then be added during the desolvation. In the case of the nanoparticle-ligand conjugates, the nanoparticles previously obtained and containing inside the pharmaceutical to be transported are incubated with the ligand or molecule which will contribute the property of specifically recognising a particular receptor of the organism.