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All these help to flush drugs out faster. Xanax is a relatively short-acting drug when compared to Valium. If you're an average-size person, you would expect Xanax to stay in your urine for 1-4 days after last use. To be safe, you should wait at least a week. Note that this is very dependent on how much and for how long you've been taking it.
The half-life of Xanax is short, but it can be detected in your system through urine, blood, and hair testing. In the case of repeated use, urine tests can detect Xanax for up to 5-7 days after the last time it was taken. Blood tests can detect Xanax for up to 1-6 days after the last time it was taken. Hair tests can detect Xanax starting between 1-7 days after use and can provide a three-month history of drug use.