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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.
Hi Renee. Traces of Xanax can be detected in urine for at least one (1) week after last use, and up to six (6) weeks for heavy use. More information here: http://prescription-drug.addictionblog.org/how-long-does-xanax-stay-in-your-system/.. Ultra short acting benzos â The half-life of ultra short acting benzodiazepines is less than 5 hours. These drugs are essentially non-accumulating. 2. Short acting and intermediate benzos â This class of benzodiazepines have half-life values from 5-24 hours and can be dosed more frequently.