A 25-year-old patient presents to the ED with altered mental status. The vital signs are significant for a temperature of 102.5°F, an HR of 135 bpm, and BP of 195/122 mm Hg. The nurse practitioner examines the patient and finds them to be stuporous with profuse diaphoresis and rigidity in the extremities through all ranges of movement. The nurse practitioner discusses the presentation with the patient’s partner, who notes the patient recently started taking risperidone (Risperdal) for an unknown psychiatric condition. Which of the following diagnoses is suspected? Acute serotonin toxicity Cocaine intoxication Malignant hyperthermia Neuroleptic malignant syndrome