This double-masked placebo controlled trial will randomize patients (n=125) who are 6 months or more after amputation and have a 3 or more month history of pain to a daily dose of amitriptyline or a placebo for 6 weeks. Patients will receive a complete functional neurological examination by one of the study physicians or nurses masked to their treatment assignment. Study participants will also be interviewed by telephone to assess pain, pain interference with activities, physical and mental health, and number of health care visits for pain, at the beginning and end of the six-week trial and four months later.