"primary related symptom was mild cognitive impairment: memory in particular, almost entirely episodic memory (autobiographical memory: stuff that&#039;s happened to you, including events, names, etc.) &amp; short-term memory. thought i was developing alzheimers. severe enough to derail career, finally lost ability to work. 
amantadine effects: built slowly, subtle but noticeable improvement in memory over 6 month period. huge improvement after 2 yrs. problems remain in calibrating decline &amp; improvement; i&#039;ve certainly improved some functionality enormously: can remember day-to-day events, plans, commitments; can remain aware of what i&#039;m doing, keep up focus; can multi-talsk (limited but definite) so i can interrupt &amp; resume interrupted activities..."