Lithium treatment is used to treat mania in bipolar disorder. Initially, lithium is often used in conjunction with antipsychotic drugs as it can take up to a month for lithium to have an effect. Lithium is also used as prophylaxis for depression and mania in bipolar disorder.
absolutely, nothing to gain there unless you need it for medicinal reasons, and they have created much more usefull treatment compounds since the days of lithium.