Amitriptyline is used to treat symptoms of depression. It works on the central nervous system (CNS) to increase levels of certain chemicals in the brain. This medication is a tricyclic antidepressant (TCA). Amitriptyline is also used to treat eating disorders, post-herpetic neuralgia (the burning, stabbing pains, or aches that may last for months or years after a shingles infection), and to prevent migraine headaches. This medicine is available only with your doctor’s prescription