Methods for inhibiting the activity of Clostridium difficile in a subject comprises administering to the subject in need thereof, a therapeutically effective amount of azaquinone or a pharmaceutical composition consisting of clofazimine or a clofazimine analogue, azaquinone, and at least one pharmaceutically acceptable excipient. Pharmaceutical compositions comprising a therapeutically effective amount of azaquinone or consisting of clofazimine or a clofazimine analogue, azaquinone, and at least one pharmaceutically acceptable excipient are provided for treating Clostridium difficile infection and diseases or symptoms associated therewith.
