Abstract: The invention relates to a novel use of fluridone—compound known per se and used as an aquatic erbicide—in the medical field, in particular as an active compound for preparing a medicament having anti-inflammatory activity. Pharmaceutical compositions comprising fluridone as an active compound and pharmaceutically acceptable carriers and/or diluents are also disclosed. Finally, there is disclosed the pro-inflammatory activity of abscisic acid (ABA), a plant hormone which is also found in mammal serum and against which fluridone acts an inhibitor.