Lithium (from Ancient Greek: λίθος, líthos, 'stone') is a chemical element; it has symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid element. Lithium is used to treat mania that is part of bipolar disorder (manic-depressive illness). It is also used on a daily basis to reduce the frequency and severity of manic episodes. Lithium toxicity, which is also called lithium overdose or lithium poisoning , is the condition of having too much lithium in the blood. This condition also happens in persons who are taking lithium in which the lithium levels are affected by drug interactions in the body. Lithium is used to treat and prevent episodes of mania (frenzied, abnormally excited mood) in people with bipolar disorder (manic-depressive disorder; a disease that causes episodes of depression, episodes of mania, and other abnormal moods). Overview: Lithium is commonly used to treat bipolar disorder. It may work by affecting certain chemicals in the brain that regulate mood. Common side effects include tremor, peeing a lot, thirst. Lithium is a mood-stabilizing prescription medicine used to treat acute manic and mixed episodes in bipolar I disorder and provides maintenance therapy from age 7, reducing manic episode frequency and severity. Learn about side effects, warnings, and administration. lithium (Li), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group, lightest of the solid elements. The metal itself—which is soft, white, and lustrous—and several of its alloys and compounds are produced on an industrial scale. Learn about the side effects of lithium, from common to rare, for consumers and healthcare professionals. Find out how lithium treats mood disorders such as mania and bipolar disorder, and how to take it. NHS medicines information on lithium – what it's used for, side effects, dosage and who can take it. Lithium is a modern, general-purpose optimization mod for Minecraft which works to improve a number of systems (game physics, mob AI, block ticking, etc) with the goal of not changing any vanilla mechanics.