People tend to feel it helping from 2 weeks to 4 weeks. Some stop smoking completely by 4 weeks. It depends on how heavy a smoker you were. A few people didn't get help at all but recommend switching to chantix after giving bupropion a fair trial.
Four weeks is also a good amount of time to feel your depression lifting. Often the starting dose has to be increased after a month or so to really feel well. The common dose people tend to be at for depression isn't a good starting dose.
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