Im on celexa too. I have been experimenting with different diet pills and found that the ephedra ones were less hard on anxiety then the non.
Becauise of the extra stimulants in xenadrine (even the non-ephedra version), the celexa may not appear to be working like usual. Just start with one pill a day, early in the day and you should be fine. After a week, your body will be able to handle both.
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Celexa and Xenadrine 
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