| ā | NMS | Malignant Catatonia | Neuroleptic-induced Parkinsonism | Delirium |
| Key features | Autonomic Instability, Delirium, Fever, Rigidity; Precipitated by use of an antipsychotic | Autonomic Instability, Delirium, Fever, Rigidity | Postural and resting tremors, Rigidity (Cogwheel), Oral-buccal dyskinesias (concurrent) | Waxing and waning consciousness, Inattention, Perceptual deficits, Behavioral disorganization |
| Notable Lab Values | Elevated serum CK, leukocytosis, electrolyte abnormalities, low serum iron | Typically normal | Typically normal | Dependent on etiology
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| Treatment | Dantrolene, Bromocriptine, Benzodiazepines, NMDA antagonists, ECT | Benzodiazepines, ECT, NMDA antagonists | Stopping the offending agent; if not, Anticholinergics, Amantadine | Typically antipsychotics; benzodiazepines for GABAergic withdrawal or status epilepticus |
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