Okay, first I would like to say hello to everyone here, and thank you if anyone can help me out with this..... I am currently enrolled in a PC1000 class and have to take randon drug tests. Unfortunately, I have severe panic/anxiety disorder, along with severe insomnia, so I try to play "nice" with the program and only take my "meds" on the weekends since they're not allowed... My question, if anyone can help me out, is how long does Xanax or Valium stay in your system?