The invention relates to a method for producing injectable medicamentpreparations containing a therapeutically and/or diagnostically effectivesubstance which is comprised of an active agent, of a spacer molecule and ofat least one protein-binding molecule. After being brought into contact withthe body, said therapeutically and/or diagnostically effective substancecovalently bonds to the body fluid constituents or tissue constituents via theprotein-binding molecule, thus providing a form of transport of the activeagent that can be hydrolytically or enzymatically cleaved, according to pH, inthe body while releasing the active agent.
