Lithium is indicated for a number of things. Most clearly, as a mood stabilizer in bipolar spectrum disorders. It is unique among mood stabilizers in that it is very robustly anti-manic. The medication treats and prevents manic episodes from occurring, providing fairly robust prophylaxis against mood cycling. Lithium is also effective in treating bipolar depression, though not as effectively. Very few of the other mood stabilizers are effective for the depressed pole of bipolar illness.