Novel methods and compounds for treating Alzheimer's Disease are provided. In one aspect, the invention provides methods for treating Alzheimer's Disease by administering certain phenothiazine derivatives. In one embodiment, the methods include administering an effective amount of a 3-oxo-7-dialkyl-amino-phenothiazine derivative, or 3-oxo-7-dialkyl-amino-phenothiazine. In another embodiment, the invention provides methods for treating Alzheimer's Disease by administering an effective amount of a 3,7-diazetidin-1-yl-phenothiazine or a derivative thereof. In another aspect, the invention provides novel azetidinyl phenothiazine compounds.
