Scientists Find 2 Existing Drugs Can Reverse Alzheimer's Brain Damage in Mice

https://www.rottentomatoes.com/m/secret_of_nimh

wwHd?

the researchers tested them in mouse models of Alzheimer's

The "mouse models" are lab mice genetically engineered to get Alzheimer's, or in short: yes

Older, now-generic drugs. Los of companies produce and sell them for other purposes.

Killing and reversing are different levels of difficult.

Both actually - this is called "drug repurposing" where they systematically screen existing drugs (that we already know are safe-ish) against disease models to find new uses, which is way faster and cheeper than developing new compounds from scratch.