It's been just over six weeks since I started taking paroxetine ("Paxil"/"Seroxat"), and so it's the end of the period referred to in "full effects may not be felt until 4-6 weeks after starting". It's interesting. I can still code (as my appalling amount of Pod-parsing code this weekend attests), so that's not affected. I was a bit worried about that.
I expected to feel more relaxed, and that has indeed happened. But an unexpected side effects is that I feel more cozy. More gemütlich. More well-fed and well-rested. More well-paced. More human.