335.3—Definitions.
         As used in this part:
    
    
        
        (a) Antidiarrheal.
         A drug that can be shown by objective measurement to treat or control (stop) the symptoms of diarrhea.
    
    
        
        (b) Diarrhea.
         A condition characterized by increased frequency of loose, watery stools (three or more daily) during a limited period (24 to 48 hours), usually with no identifiable cause.
    
    
        
        (c) Travelers' diarrhea.
         A subset of diarrhea occurring in travelers that is most commonly caused by an infectious agent.