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Probably fake, but big if true.
The incontinence part checks out if he's actually taking memantine (of which Namenda is a brand name of), though this could still just be some phony who did research. We basically don't know specifically how memantine causes incontinence which makes it hard to counter.
Memantine is used for moderate to severe symptoms, moderate = having a hard time functioning and likely needing some help, severe being closer to an awake vegetable. It's usually combined with cholinesterase inhibitors like Donepezil, sometimes they just mix the 2 together, I wouldn't be surprised if he was also taking that or upgraded to both after this guy stopped working for the campaign (assuming hes not full of shit).
It also doesn't explain the IV mark at all, memantine is taken orally, usually in pills, in small doses.
It
can explain breathing problems though, shortness of breath is a common side effect, along with sleepiness and occasional anger, it's also much worse if hes being overdosed. It also usually raises your liver enzymes, a sign of liver damage, but without causing any significant damage to the liver, the one time it happened it was easily reversed by stopping the drug, so I wouldn't be expecting jaundice or anything.
Memantine can somewhat slow but not stop dementia, while generally lowering symptoms while taking it, based on how he acts now he must of either had it for a long time or hes progressing rapidly, if he wins I imagine he'll progress into non functional before the first term is up.
If this is true then they can't guarantee Biden will have a lucid day during a debate without some flexibility on the date, and the later in the day it happens, the worse. They'll either want to pick or adjust the day on short notice and keep it early in the day, or avoid a debate entirely.
This is all
assuming the 4chan guy isn't absolutely full of shit though.