Is pramipexole helpful for bipolar people?

Yes, with caution. Pramipexole has shown benefit in research trials in treating depression symptoms in bipolar disorder. However, it can also "flip" depressed patients to mania. Patients who try it should be on a good anti-manic regime before adding pramipexole.
Pramipexole. has been used as augmentation for bipolar depression. More typical meds fall into classes of mood stabilizers (Lithium?/ anticonvulsants like valproic acid, divalproex or lamotrigine) & atypical antipsychotics (Quetiapine, aripiprazole, olanzapine or risperidone).