Attention deficit hyperactivity disorder predominantly inattentive

Attention deficit hyperactivity disorder, predominantly inattentive presentation (ADHD-PI or ADHD-I), is one of the three recognized presentations of attention deficit hyperactivity disorder (ADHD).

Historically, ADHD was not divided into presentations. Between 1987 and 1994, during the publication of the DSM-III-R, the disorder was classified as a single entity without subtypes. In the DSM-5, these subtypes were replaced with “presentations,” reflecting that an individual’s symptom profile can change over time.

The predominantly inattentive presentation is characterized primarily by symptoms of inattention—such as difficulty sustaining attention, procrastination, hesitation in task initiation, and frequent forgetfulness. Unlike the hyperactive-impulsive and combined presentations, individuals with ADHD-PI exhibit fewer or no symptoms of hyperactivity and impulsivity. Lethargy and fatigue may be reported, but ADHD-PI is distinct from cognitive disengagement syndrome (CDS), a separate construct characterized by sluggish cognitive tempo.