I was just switched from Bupropion SR 150 3x a day to Buprobion ER 200 2x a day. But the pharmacy label on the new bottle says Buproprion HCL ER 200 and below that generic for Bupropion HCL SR 200 but it's only twice a day. I thought only the brand (XL) was still the only 2x a day version. So now I'm totally confused about the difference between SR, ER, and XL. I'd been feeling worse, but the last 3x a day was for 150. So seems like now my dosage has been reduced? Does this make sense. (My doctor also has a pharmacy degree, and gets *very* annoyed at being questioned about my medicines.) I feel so dumb, but I just can't figure this out. Could someone here please straightened me out--unconfuse me? Thanks very much!