Amitriptyline is an antidepressant that balances chemicals in the brains of people with depression. It can help by providing everyday energy, relieving mood swings, improving quality of sleep and relieving anxiety. Amitriptyline hydrochloride is the active ingredient, and it's also known as the brand name Elavil. It is used for neuropathic pain and treatment of depression. Amitriptyline is taken orally between one to four times daily or as prescribed by your doctor. Usually, you'll start at a low dosage at first to avoid side effects.