...sometimes quite effectively.  
- **BPD/NPD:** medication helps with symptoms (depression, impulsivity, anxiety), but it doesn’t “repair” the personality structure. Only long, consistent therapy (e.g. DBT, Schema Therapy, Transference-Focused Therapy) makes change possible.  

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### **3. Severity vs. Treatability**  
- **Gravest?** In terms of suffering for patient and environment, yes — BPD and NP...