Norepinephrine has also been implicated with memory and the beta blockers which block adrenaline can affect memory. Glutamate is important for stimulation of memory and medications which block the NMDA glutamate receptors can adversely affect memory. Serotonin can also play a role in memory. Finally, as mentioned above, the dopamine system working subcortically can affect the working memory in the frontal lobes.
Symposium 1999 – "Parkinson’s Power Across America