Medicament or medicine product, for preventing and/or treating allergic respiratory diseases (preferably allergic rhinitis and asthma) and viral respiratory diseases (preferably cold and flu), comprises at least one osmolyte as active agent. ACTIVITY : Antiallergic; Antiinflammatory; Respiratory-Gen.; Antiasthmatic; Virucide; Antimicrobial; Cytostatic. MECHANISM OF ACTION : None given.