I don't know how long it takes to clear normally. It took me two days to get rid of the worst of the side effects. In theory, with a 24 hour half life, Half would be gone in 24 hours and then half of that half in another 24 hours etc. Depends on how sensitive you are to it. I can't tell you any thing about paxil except that I can't take it. Celexa gave me restless leg syndrome. So far I'm doing Ok off all the medication, I'm having a fair bit of luck with visualization and distractions to keep the negative thoughts at bay. Visualization is like meditation except instead of thinking about nothing you pick out a happy place or time and concentrate on it expanding it till it crowds out all that unhappy feeling. It can be done almost anywhere except when driving. Good luck with the Paxil.