I dont know about the generic lamictal, but the generic Wellbutrin was a living hell for me. the pdoc told me that most of the generic psych meds do not work the same way as the name brand for a large number of people, and she did the same thing you are having to do. (write a letter and fill out a bunch of forms stating that she did not want me to take the generic version) The pharmacist told me the same thing when I filled the perscription - but the pdoc pulled up endless amounts of research to the contrary. Once she faxed in the paperwork I was able to fill the name brand Wellbutrin the next day. I hope the process works quickly for you as well.