Used primarily as a tricyclic antidepressant, it helps manage symptoms of major depressive disorder. It works by affecting the balance of certain natural substances in the brain, such as serotonin and norepinephrine, which are linked to mood regulation. It may also be prescribed off-label for anxiety, insomnia, or chronic pain due to its sedative properties. Often considered when other antidepressants fail, it is valued for its strong calming effect, making it suitable for patients with depression accompanied by agitation or sleep disturbances.