Bipolar disorder (sometimes still referred to as manic-depressive disorder) is a mood disorder characterized by dramatic variations in mood ranging from depressed to manic. Group therapy is an excellent option for individuals who struggle with bipolar disorder. You can read more about bipolar disorder here.
Yet even without going into more detail, we have to agree that first sentence is a lot to take in. The great dilemma for someone (including us as therapists) who doesn't organize an understanding of who people are around labels and diagnoses is how to take seriously the very serious problems that come with bipolar disorder without relating to a person with that diagnosis as that diagnosis.
For some, bipolar can be life-threatening. It's a serious matter requiring serious care, and any therapist who takes on a patient with bipolar has a responsibility to see that everything is in place that can be to minimize the risk of harm.