Amitriptyline for fibromyalgia and neuropathic pain: An Assessment. Amitriptyline (once known by the brand name Elavil) is a tricyclic antidepressant that is often prescribed in low doses to treat neuropathic pain. Before there were any FDA-approved drugs to treat fibromyalgia, amitriptyline was also frequently prescribed off-label to treat FM symptoms. Although it is no longer considered a first-line treatment for fibromyalgia, a number of FM patients still find it helpful.