The last time I went in to get my Welbutrin XL prescription filled they charged me extra (a lot) because now there is "a generic" available. I paid it because my doctor had told me that he has had complaints about the generic. The lady at the pharmacy said that my doctor has to write the prescription that I cannot have it substituted in order for me to not pay extra. I plan to do just that after reading all of your experiences.... Maybe those of you on the generic or switched can ask your doctor to specify it on the Rx. - happy on Welbutrin XL