Central nervous system disorders Brain tumor Encephalitis Guillain-Barré syndrome Head trauma Hydrocephalus Meningitis Psychosis, acute Stroke Subarachnoid hemorrhage Pulmonary lesions Pneumonia, including fungal and mycobacterial Other intrathoracic infections Neoplasms Respiratory failure or positive pressure ventilation or both Malignancies Small cell carcinoma of the lung Other small cell carcinomas Pituitary tumors, craniopharyngioma Squamous cell cancers of the head and neck Most other malignancies have been reported to cause SIADH but are uncommon Drugs Antidepressants: tricyclics, SSRIs, monoamine oxidase inhibitors Antineoplastics: cyclophosphamide, vincristine, vinblastine Carbamazepine, oxcarbamazepine Clofibrate Desmopressin (DDAVP), vasopressin (ADH) Methylenedioxymethamphetamine (MDMA; Ecstasy) Antipsychotics, typicals more often than atypicals Amiodarone Chlorpropamide, tolbutamide NSAIDs (rare without another concomitant etiology) Others Acute intermittent porphyria AIDS Hereditary Nausea Pain Postoperative Stress |