Hi,
It is not all about the reduction of a symptom, remember. Long ago - 200+ years - a French physician pointed out that a symptom is the mind's way of of resolving a problem it can't otherwise solve. What I am saying is, you must address what the dynamic that is going on. Is this person destroying him or herself to get even with mon and dad? Is this person certain that he or she is unlovable? Etc. Aim at unraveling that next. And too, keep helping the person find joy without the flashing lights and drinks of the Casino!
Steve