Which personality disorder is characterized by a marked impulsivity and instability in interpersonal relationships?

Borderline Personality Disorder is characterized by a pervasive pattern of instability in interpersonal relationships, self-image, and affects, along with marked impulsivity. Individuals with this disorder often experience intense and unstable emotions, leading to fractured relationships. Their impulsivity can manifest in various ways, such as risky behaviors, substance abuse, or self-harm, often in an attempt to cope with emotional distress or to evoke care and attention from others.

Interpersonal relationships are particularly affected, as individuals may idealize someone one moment, then devalue them the next, which leads to turbulent relationships. This instability stems from a fear of abandonment, contributing to the difficulty in maintaining consistent connections with others. The combination of these features makes Borderline Personality Disorder distinct from other personality disorders, where impulsivity and instability are not as prominently defined.