... did this within a month and am having horrible side effects now. i think i did it too quickly? can i be on fluoxitine and wellbutrin at the same time for a while as i taper off the fluoxitine. if i go to one 20mg fluoxitine a day how long does it take to get into your system and make you feel better? what is the difference between fluoxitine and wellbutrin. thanks (i have been on fluoxitine for about 10 years - 40mg per day)