Because coffee is a diuretic, it helps to push the Phentermine out of your system faster, so you aren't getting the total effects from it. Caffiene does change the effects of it some. I would say if you have to have that morning cup of coffee, drink it about an hour or so BEFORE taking the Phentermine. I would honestly recommend though, if you can, drop it all together, or consider de-caf.
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