I think It's because thy can induce or make mania worse. I also think that they sometimes dont work long term with bp. I say this because it's one of the reasons my pdoc mentioned bp as a diagnosis to me. I've been on Prozac, Zoloft, Wellbutrin, Pristiq and combos of them. All which seem to work and then crap out after a while.

But if it works for you, I don't know why you shouldn't be on them. Maybe someone who is better versed in meds will help you out.