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Lithium affects the flow of sodium through the nerves and muscle cells of the body, and interferes with the production and uptake of neurotransmitters in the nerves.  Because sodium increases excitation, lithium is used to treat the manic phase of Bipolar Disorder , which used to be called Manic-Depressive Syndrome. ...

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Lithium affects the flow of sodium through the nerves and muscle cells of the body, and interferes with the production and uptake of neurotransmitters in the nerves.  Because sodium increases excitation, lithium is used to treat the manic phase of Bipolar Disorder, which used to be called Manic-Depressive Syndrome.  Because it also affects the concentration of serotonin and tryptophan in the brain, it is used for treatment of other depressive disorders.  Lithium carbonate is most commonly used, but lithium saulfate, lithium citrate and other forms of lithium salts are also used.

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