Lithium carbonate is a therapeutic drug for psychiatric system disorders, mainly for the treatment of mania. Lithium carbonate is in the form of lithium ions to play a therapeutic role, anti-manic episodes of the mechanism is to inhibit the release of calcium ion-dependent norepinephrine and dopamine from nerve endings, to promote the reuptake of synaptic interstitial norepinephrine by nerve cells, increase its conversion and inactivation, so that the concentration of norepinephrine is reduced, but also to promote the synthesis and release of 5-hydroxytryptophan, which is conducive to the stabilization of mood. Lithium carbonate is mainly used in the clinical treatment of mania, bipolar disorder with alternating episodes of mania and depression, and psychiatric disorders also have a good treatment and prevention of relapse. For recurrent depression also has the efficacy of preventing episodes, but also for the treatment of schizoaffective psychosis.