Clozapine (clozaril) for good for bipolar?

Yes, however: Clozaril/clozapine is an effective antipsychotic medication with many cautions requiring regular blood tests. It can be effective for severe or difficult to treat bipolar disorder. Given the potential side effects and requirement of blood tests, many doctors try other, safer medications or combinations first.

Possibly: Clozapine is a medication used to treat treatment resistant psychotic symptoms. People who have bipolar disorder may also experience psychotic symptoms. If these psychotic symptoms are so refractory - meaning they don't respond to treatment with first line psychotropics then clozapine may be considered. First line medications for bipolar disorder include: mood stabilizers and antipsychotics.

Clozaril: Not as a first line medication. Clozapine (brand names: Versacloz, FazaClo, Clozaril) is an antipsychotic medication used as a treatment for refractory Schizophrenia & for Schizophrenia or Schizoaffective Disorder associated with recurrent suicidal behavior. It has been used off-label for refractory bipolar disorder.