The older generic
wellbutrin you must be refering to was the regular release, (not sustained release or SR). The Wellbutrin SR generic just came out. I would not imagine any difference in results between these two drugs. They both contain the same active ingredient, the only difference in the two is what makes up the physical tablet, (fillers, colors, binders, etc). It is a money saver and is worth trying out. If you can't tolerate it, perhaps your doctor can speak to the insurance company to get them to allow the Brand name to be used. Good luck.