Amitriptyline HCL is used to relieve symptoms of depression such as loss of interest in daily activities, changes in appetite, or tiredness. Amitriptyline is also used to treat certain types of pain. This medicine is a tricyclic antidepressant used to treat depression. It may also be used to treat chronic pain and other conditions as determined by your veterinarian. Manufacturer may vary from product shown. Prescription items are NON-RETURNABLE and NON-REFUNDABLE.