I've been taking generic Bupropion XL 300mg once a day for about 2 years. I got a new refill last Sunday and started experiencing a rapid heart rate within a couple hours of taking it.

I didn't immediately associate it with Bupropion but I've since eliminated any other drug/lifestyle changes and this is still happening, always within a couple hours of my dose. According to the bottle label, it's the same manufacturer as my previous supply (mfg code is "PAR" and pills are stamped "A 102" -- internet tells me Anchen Pharmaceuticals, a subsidiary or Par Pharmaceutical).

Anyone have any thoughts about this?