Citalopram
"I have been on 40mg of this medication for several years now and it has worked very well in treating my Obsessive compulsive disorder, anxiety and panic disorders. Over the past 6 or so months, however, I've noticed it had become less effective and I eventually experienced the "pop out" effect. I am still taking it until I can see a psychiatrist, but the past few weeks have been agonizing.

Overall, I would recommend it as an effective medication with very few side effects. It's just too bad it didn't last longer for me."