Oregon murderer posted as "lithium_love"

[Michael.Felli]

"The posts were left under the user name "lithium_love." Two of them were specifically about recent shootings -- one about Vester Flanagan, who killed two local news reporters in Virginia, and one about an officer slain near Houston in August."

I assume he was taking the medication, then. Isn't this the preferred drug for manic/depression? What conditions does lithium treat?

http://www.cnn.com/2015/10/03/us/oregon-umpqua-community-college-shooting/index.html