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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.
Lithium side effects Get emergency medical help if you have signs of an allergic reaction to lithium: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have: 1  a light-headed feeling, like you might pass out; 2  shortness of breath; 3  pounding heartbeats or fluttering in your chest; 4  increased urination; 5  weakness, dizziness or spinning sensation; 6  confusion, memory problems, hallucinations; 7  fever; 8  muscle stiffness, slurred speech;