A method is proposed for immobilization of anti-ischemic drug phosphocreatine on the surface of aminated silica and magnetite nanoparticles of similar size and shape. The synthesis of spacer and the coordination-ionic drug immobilization technique are described. Magnetite nanoparticles demonstrated much more efficient chemisorption of phosphocreatine than silica nanoparticles. The method was recommended for practical application.