Hi, I have been taking the name brand Wellbutrin 100 mg, one time daily for probably 20 years. Now, the manufacturer is discontinuing making it. I have so many chemical sensitivites, from a work accident, where my system has formaldehyde in it. Even the fillers in alot of meds make me very sick.. My doctor is great about working with me, as he knows how highly sensitive I am.. When we found out the Wellbutrin was no longer going to be available, the dr suggested for me to take 1/2 of Wellbutrin 100 mg, and 1/2 of Bupropian 100 mg.. Well, after about 1 and 1/2 weeks, I started not being able to sleep, my mind was racing, and I just felt horrible.. I have continued taking these for a month and a half, still can't sleep but maybe 1-2 hours at a time.. My body is exhausted.. I had a few Wellbutrin (name brand) left, and I decided to take one a day for about 3-4 days. Today, I was able to sleep almost 8 hours.. My question is: The manufacturer says Wellbutrin SR is still available. Can you tell me the difference between the Wellbutrin 100 mg and the Wellbutrin SR 100 mg?? Are the ingredients and fillers close to the same? Thank you so much.. Shirley Clark, YYYY@YYYY