Sorry, I can see the play on words. Antibiotics cure only bacterial infection. Antibiotics cure something. All other chemical medicines treat only symptoms not the disease that causes them.
Regarding dementia, Dr Mark Mattson has done some remarkable work using fasting protocols to prevent and reduce symptoms of dementia including Alzheimer's disease.
http://www.johnshopkinshealthreview.com/issues/spring-summer-2016/articles/are-there-any-proven-benefits-to-fasting