Thanks, everyone. Her psychiatric-nurse-practitioner-therapist told her to quit cold-turkey. I think the reason may be that she was only on it for about three weeks. Her practitioner thought that the lithium would be enough to stabilize her so that the Celexa wouldn't cause her to cycle.

She is still cycling, but not with the extremes that she had before. So she gets a bit anxious, but not to the point of a panic attack. No hypomania, either, I don't think. And while she has spells of depression, they're not as severe or long-lasting (she roller-skates them away). We think the lithium has done her a lot of good, especially since it's only been three weeks.

My daughter has been having these cycles for two years now, with a six-month respite that began last spring and lasted through the summer (is it usual to have a remission like that?). We were trying to get a diagnosis for her the whole time. There's a lot of Graves disease (hyperthyroidism) in the family*, so when she first described her symptoms, I was sure it was that. Tests came back normal--and then weird for a while (contradictory)--and then normal normal normal normal again. It took me two years (including the remission) to be convinced that she didn't have a thyroid condition. So we're still getting used to the idea that this is bipolar.

Thanks for the welcome, and the help.

Abby
*yes, I know lithium can mess up the thyroid...