Thank You, my mother is 90 yrs. old. shes having surgery for colon/reneal failure polyps to be removed. Shes under a lot of pain. I assumed cause it might be cancerous that Dr. Khristian A Noto Colon/Rectal failure MD prescribed a pain killer 100 mg every 12 hrs according to her pain. It starts with a T that's all I know can you please tell me what it might be and the side effects?