| http://www.w3.org/ns/prov#value | - please i need to know ho long xanax or xanax xr will show up in my urine ## Well the peak plasma levels and the controlled release, result in the XR pills being at full potency for 5 hours and in your system in lesser amounts for another 6, so just the half-life, where the med is down to 50% of its peak concentration in your body is a long time period.
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