Perils of mercury.

The historical items pertaining to mercury are outlined, and its toxicity and former medicinal uses are discussed. The diversity of the toxic effects by the different forms of mercury as well as the routes of administration are illustrated in three case reports. The importance of diaphoresis in the treatment of mercury poisoning as well as the status of the use of chelating agents are reviewed. The need for the surveillance of mercury and the prevention of exposure to mercury from environmental and dietary sources are emphasized. The importance of excluding mercury toxicity in patients with psychiatric and neurological disorders is stressed.