I didn't feel Lithium kick in when I took it. I think it's just a constant therapeutic level going...hence the blood tests. Like Wander said, stimulants and benzodiazepines tend to have a mild "kick in." I felt Seroquel, an anti-psychotic kick in in the sense I became sleepy.

I have had a couple of antidepressants take effect fairly quickly when I started them (rather than the standard 4-6 weeks)...Wellbutrin and Lexapro, for me.

Keep posting. xo