Prof. Claudio A. Naranjo, from the Clinical Pharmacology Program of the Addiction Research Foundation of Toronto, Canada, gave the lecture Present trends in the pharmacotherapy of drug and medicinal product addiction. This is the eighth submission organized by the Esteve Foundation and was held on May 16, 1991 at the Royal Academy of Pharmacy. Dr. Naranjo’s areas of investigation include the clinical pharmacology of alcoholism and pharmacodependence and the assessment of the toxicity of medicinal products.