Hi, I've (M27) been a member of this forum for a long time, because my partner (F25) has bpd and it's a very good source of info and useful advice for me and how to act properly; avoid triggers, how to cope with serious episodes and honestly a better understanding of the condition etc.. 

Anyway... I am bipolar 2 and after a myriad of drug combos the one that works best for keeping me consistently stable is lamotrigine as a standalone.

Anyway my question is why isn't lamotrigine prescribed more regularly for bpd? Most of the anecdotes I see regarding lamotrigine for bpd are generally positive and it doesn't really make logical sense to me why the first line for bpd seems to be SSRIs or SNRIs and not a mood stabiliser.. Please educate me why lamotrigine doesn't seem to be a common medication, have I just cherry picked info for some kind of pointless confirmation bias or is it a under utilised medication?

(Note - this is in absolutely zero way an attempt to convince or even talk to her about this orchanging medication, I'm not a doctor !  But solely out of my own curiosity.)