Can only talk from my own experience, but, she has prescribed all sorts, including stuff that is very much off limits for GPs. We have also discussed LDN as an option. I've managed to move most things to my GP, with the exception of midodrine, which they flat refused to go anywhere near, but thankfully it's not too expensive (unlike sodium cromoglicate which we tried and was £400 for a month - my bank balance was relieved that didn't make a noticeable difference for me!)