Pregabalin is used to alleviate pain caused by diabetic nerve damage or shingles infection. It may also be used to alleviate nerve pain associated with spinal cord damage. Nortriptyline is a tricyclic antidepressant that raises levels of chemical messengers such as serotonin and noradrenaline, which prevent pain signals from moving in the brain. Pregabalin and Nortriptyline tablets are also used to alleviate pain in fibromyalgia patients. They work together to alleviate pain caused by nerves.