“…Some studies report BPD as the most common personality disorder among adult BP patients (O'Connell et al, 1991;Peselow et al, 1995;Vieta et al, 1999). Adult BP patients with comorbid personality disorders have less favorable outcomes including longer and more frequent hospitalizations (Barbato and Hafner, 1998;Dunayevich et al, 2000), increased suicidal ideation and attempts (Carpiniello et al, 2011;Vieta et al, 1999), greater symptom severity and functional impairment (Barbato and Hafner, 1998;Carpenter et al, 1995;George et al, 2003), earlier age of mood symptom onset (Vieta et al, 1999), greater unemployment (Kay et al, 2002), higher rates of axis I comorbidity (Kay et al, 2002;Preston et al, 2004), and worsened long-term outcomes of symptomatic and functional recovery (Bieling et al, 2003;Dunayevich et al, 2000) compared to those without personality disorders. This comorbidity has been further associated with poor pharmacotherapy outcomes as evidenced by reduced compliance (Colom et al, 2000) and response to treatment (Barbato and Hafner, 1998), and necessity for polypharmacy (Kay et al, 2002).…”