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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. 1  In the case of repeated use, urine tests can detect Xanax for up to 5-7 days after the last time it was taken. 2  Blood tests can detect Xanax for up to 1-6 days after the last time it was taken.