A 23-year-old woman overdoses on acetaminophen and has a history of self-harm. Which personality disorder is she most likely suffering from?

The answer is based on the characteristics associated with borderline personality disorder, which is often marked by intense emotional instability, impulsive behaviors, and difficulties in interpersonal relationships. Individuals with this disorder may engage in self-harming behaviors as a way to cope with emotional distress or to express feelings of emptiness and abandonment.

In the case of the 23-year-old woman who has a history of self-harm and has overdosed on acetaminophen, her actions may reflect the impulsive and self-destructive behaviors commonly seen in borderline personality disorder. This disorder is also associated with a pattern of unstable relationships and a fear of abandonment, both of which can contribute to such high-risk behaviors as overdosing.

The context of self-harm is particularly relevant, as it is a significant feature in many individuals with borderline personality disorder, often linked to their profound emotional pain and difficulty managing their emotions. Therefore, given her history and the situation described, borderline personality disorder is the most fitting diagnosis.