Side Effects?

From Cesca today, posted by a writer referred to as "JumpyPants":

We need to see what kind of drugs John McCain takes, and for what ailments,
because it's clear that John McCain is not only divorced from what ordinary
Americans experience, he's also divorced from reason and facts.

To this day, McCain't has not released his full medical records. Is there anyone out there who can tell me if there are any drugs that can have a side effect of dementia, and what they're used for?