Been on fluoxetine 20mg for a month now.
Been on Citalopram 10mg (which is nothing and did nothing) for three weeks now to ease me in. Upped to 20mg last friday. My doc told me that it takes time for changes to happen and you'll have better and worse days. I have appointments with my doc every 3 weeks for now to see if the AD's are taking effect. If you don't notice any changes at all, tell your doc. These things take time though, at least that's what I've heard.
Edit: I have a friend who also suffers from depression far longer than I have and has been in medical care for more than two years. He told me that he is now down to 30mg (not sure what he's on though). It affects everyone differently and I'm glad that my doc is easing me in rather than giving me some potent dose of medication at the beginning. It's nothing you can cure with taking a few highly dosed pills and everything is suddenly better.