Disclosed herein are compositions and methods for treating tauopathies such as Alzheimer's disease (AD). Also provided herein are methods of reducing or disrupting tau aggregation in a subject, and methods of reducing tau protein in a subject. The methods may include administering to the subject a therapeutic amount of hexachlorophene, or a pharmaceutically acceptable salt thereof. Further provided herein are pharmaceutical compositions comprising hexachlorophene, or a pharmaceutically acceptable salt thereof, for the treatment of a tauopathy in a subject.
