I know that it is not approved for this and that probably nobody else has ever had this happen but I swear that mirtazapine was a mood stabilizer for me for a good while. I took it when I was pretty new and then had to stop it because it was too sedating in grad school. I wound up back on it in grad school and about 6 months later is when things changed and I now know I was going from rare manias to BIPOLAR. But I got through 8 months, including 6 months of clinicals, and then the first 6 months of working and taking my boards without the bipolar really breaking loose and the only explanation I have for that is mirtazapine since as soon as I stopped it I was fiercely and truly bipolar (but still a year from diagnosis). It felt like a mood stabilizer does now that I know the feeling. I think for whatever reason it was just enough to keep me from losing it completely during that really critical time period.