Pharmaceutical composition and food comprising edible carboxylic acid and/or its acidic salt and optionally caffeine, crude drug and pharmaceutical acceptable carrier are disclosed. The invention also discloses the use and method of composition or food. The composition or food of the present invention can prevent, treat or relief allergy, ache, cold, viral infection, thrombus or clotting, inflammation, cancer, intoxication, memory decay, caffeine dependence. The invention also relates to feedstuff for animals.