A bit of background to support this point, bipolar disorder also does not respond to antidepressants, see http://www.jnalaw.com/effectivness%20of%20antidepressants%20...

It is effectively treatable for most sufferers, of which a combination lithium-lamotrigine therapy is currently considered the treatment of choice. See http://archpsyc.jamanetwork.com/article.aspx?articleid=20732...

Talking therapies do not stop these kinds of mood swings, but they may be able to help people cope with the effects of mood swings. As importantly, they can help people follow their prescription, failure to do so being the #1 reason for these pharamceutical treatments to fail.