Generic Dilantin is used for treating tonic-clonic (grand mal) and partial seizures. It is also used to prevent and treat seizures that may occur during or after brain or nervous system surgery. More info »
Generic Exelon is used for treating mild to moderate dementia (eg, impairment of memory or judgement, abstract thinking, changes in personality) in patients with Alzheimer disease or Parkinson disease. More info »
Regarding the effect: I do notice an increase in bloodflow and a better
stamina using the pills (I use 50mg). A side-effect I have noticed is that
my nose clogs up so I seem like I have a cold for an hour or so after taking
one pill. No other side-effects than that.