Lithium carbonate is approved for use to treat bipolar disorder in people 12 years of age and older. Sometimes, doctors prescribe lithium carbonate to treat conditions other than bipolar disorder. These are considered off-label uses. Lithium carbonate may be used off-label to treat depression, Graves' disease, cluster or migraine headaches, neutropenia, agitation, and syndrome of inappropriate anti-diuretic hormone secretion, or SIADH. However, such uses are "off-label" and unapproved by the FDA for a reason -- for example, there may be too many side effects to outweigh the risks, or the effectiveness of lithium carbonate for that particular treatment hasn't yet been proven.