My mom has been taking this medication for a year and her doctor told her this morning that she won't be able to have her script renewed, depending on what the test he did this morning shows. Her tests were taken a month apart, and both show nothing in her system. She was told that her doctor has to report these findings and she is concerned, but most of all because she wants to know if she should have her liver or kidneys tested to see if anthing shows there? I suggested that she have her doctor perform a hair or blood test. What I want to know, does anyone know why it wouldn't show up in her urine? THANKS!!