Which symptom is NOT associated with neuroleptic malignant syndrome?

Neuroleptic malignant syndrome (NMS) is a serious and potentially life-threatening condition often associated with the use of antipsychotic medications. Key symptoms include high fever, muscle rigidity, autonomic dysregulation, and altered mental status which can often present as stupor.

While mood swings can occur in various mental health disorders and may be experienced by individuals taking psychotropic medications, they are not a hallmark symptom of NMS. The syndrome is characterized more by physical symptoms and severe body system reactions rather than changes in mood or affect, which are more typical of psychotic disorders themselves rather than NMS. Therefore, mood swings do not fit within the primary symptomatology of neuroleptic malignant syndrome, making it the correct choice for this question.