Counseling or therapy is the most common treatment for Narcissistic personality disorder. If you or someone you care about has narcissistic personality disorder, there are certain therapies that may be helpful. Although there is relatively limited data on this topic, the therapeutic approaches often applied include:
Psychodynamic psychotherapy, which helps people better understand their thoughts and emotions
Cognitive behavioral therapy (CBT), which helps people identify and change destructive thoughts and behaviors
Dialectical behavior therapy (DBT), which teaches people healthy coping skills, emotional regulation techniques, and how to stay in the present
Couples counseling, which helps people improve their relationships with their partners or spouses
Family therapy, which helps people recognize and effectively deal with family relationship issues, such as those related to communication and conflict
https://www.verywellmind.com/how-to-recognize-a-malignant-narcissist-4164528