Nortriptyline is mainly used to treat depression. Nortriptyline is in a group of medications called tricyclic antidepressants. It works by increasing the amounts of certain natural substances in the brain that are needed to maintain mental balance.
Nortriptyline is also sometimes used to treat panic disorders and post-herpetic neuralgia (the burning, stabbing pains, or aches that may last for months or years after a shingles infection). Nortriptyline is also sometimes used to help people stop smoking. Talk to your doctor about the possible risks of using this medication for your condition.
Summary from MedlinePlus.gov, click for more information.