Nortriptyline is a medication primarily used to treat depression and certain types of chronic pain. It belongs to a class of drugs known as tricyclic antidepressants, which work by balancing chemicals in the brain that affect mood and emotional state. In addition to its use for depression, Nortriptyline may also be prescribed for conditions like anxiety and migraine prevention. It is important for patients to follow their healthcare provider's instructions regarding dosage and to discuss any potential side effects, which can include dry mouth, drowsiness, and weight gain.