FWIW, from what I've read (http://www.newyorker.com/reporting/2008/11/10/081110fa_fact_...) there were (at least) no therapies or treatments that reproducibly help psychopaths:
The psychiatric profession wanted little to do with psychopathy, for several reasons. For one thing, it was thought to be incurable. Not only did the talking cure fail with psychopaths but several studies suggested that talk therapy made the condition worse, by enabling psychopaths to practice the art of manipulation. There were no valid instruments to measure the personality traits that were commonly associated with the condition; researchers could study only the psychopaths’ behavior, in most cases through their criminal records.
And now there are, at least in the sense of reducing criminal behavior:
In a landmark 2006 study of a specialized talk-therapy treatment program, conducted at a juvenile detention center in Wisconsin, involving a hundred and forty-one young offenders who scored high on the youth version of the checklist, Michael Caldwell, a psychologist at the treatment center and a lecturer at the University of Wisconsin at Madison, reported that the youths that were treated were much more likely to stay out of trouble, once they were paroled, than the ones in the control group.
But note that the linked article is from 2008. Perhaps things have changed since.