PHARMACOLOGY STUDIES IN ANIMALS SHOWED THAT LEVODROPROPIZINE DOES NOT ENHANCE THE EFFECT OF ACTIVE SUBSTANCES ON THE CENTRAL NERVOUS SYSTEM (BENZODIAZEPINES, PHENYTOIN, IMIPRAMINE). IN CLINICAL PHARMACOLOGY STUDIES, THE BENZODIAZEPINE ASSOCIATION DOES NOT MODIFY THE EEG PROFILE (ELECTROENCEPHALOGRAM). STILL, IT IS NECESSARY TO BE CAUTIOUS IN THE SIMULTANEOUS ADMINISTRATION OF SEDATIVE DRUGS, PARTICULARLY IN SENSITIVE PATIENTS. CLINICAL DATA DOES NOT SHOW INTERACTION WITH DRUGS USED IN THE TREATMENT OF BRONCHOPULMONARY PATHOLOGIES SUCH AS BETA-AGONISTS, METHYLXANTHINE DERIVATIVES, CORTICOSTEROIDS, ANTIBIOTICS, MUCOREGULATORS AND ANTIHISTAMINES.