I've been on generic Bupropion 200 mg SR for exactly 4 weeks today. I've been switched to name brand Wellbutrin 300 mg XL and took my first dose today. Around how long will it take for me to feel a difference in dosage? What signs or symptoms should monitor to better gauge the onset?
You could feel improvement in as little as a week with the dosage increase of Wellbutrin from 200mgs to 300mgs. Generally takes upwards of a month for full effect. You may notice some slight side effects, but probably very little. I found that a mild headache, diarrhea, and, in the case of Wellbutrin, an increased heart rate occurred with onset and dosage increases. None of this is of concern unless it doesn't subside.
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