New oral analgesic, tramadol, gains marketing approval.
D000284:Administration, Oral; D017277:Drug Approval; D006801:Humans; D010146:Pain / Q000188:drug therapy; D014147:Tramadol / Q000008:administration & dosage / Q000627:therapeutic use*; D014481:United States; D014486:United States Food and Drug Administration
D014147:Tramadol