Lithium carbonate is a therapeutic drug for mental disorders, and the specific analysis is as follows: First, it is mainly used for the treatment of mania. Lithium carbonate acts in the form of lithium ion, and the mechanism of anti-manic episode is mainly through inhibiting the release of norepinephrine and dopamine, thus playing the role of anti-mania. Secondly, it can promote the reuptake of prominent interstitial norepinephrine by nerve cells, and increase the conversion and inactivation, so that the concentration of norepinephrine, a neurotransmitter, is reduced, which plays an anti-manic effect. Third, promote the synthesis and release of 5-hydroxytryptamine, the role is to help stabilize mood. In clinical practice, lithium carbonate, firstly, is used for the treatment of mania, and has a good therapeutic and preventive effect on patients with bipolar disorder with alternating episodes of mania and depression. Secondly, it also has a preventive effect on recurrent depression, and can also be used to treat schizo-affective psychosis.