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You can't gain weight without eating more. According to Why Does Lithium Cause Weight Gain? lithium binds to a receptor 5-HT1B which influences the serotonine system influencing your mood, and also your appetite. This is the 1999 paper by Olivier Massot they refer to 5-HT1B Receptors: A Novel Target for Lithium: Possible Involvement in Mood Disorders.
A: Eskalith, Lithobid (lithium) affects the flow of sodium through the nerves and muscles of the body. Lithium is used to treat manic episodes in bipolar disorder. Common side effects of Lithium include weakness, nausea, loss of appetite, itching skin, thinning of the hair and tremors.