Abstract: The invention provides a method of enhancing the action of a pharmaceutical agent selected from the group consisting of the anti-infective agents, the group comprising of the antimicrobial agents, the anthelmintic agents and the anti-ectoparasitic agents, but excluding coal tar solution and H1-antagonist antihistamines, and from the group consisting of the CPNS agents selected from the group of compounds acting on the central or peripheral nervous system, but excluding coal tar solution and H1-antagonist antihistamines and also excluding anti-inflammatory, analgesic and antipyretic agents and also provides an enhanced method for the administration of a nucleic acid substance to the cells of an animal, a plant or a micro-organism.