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Answers. Best Answer: Alprazolam (xanax) has a half life of 6 - 12 hours so half of the drug will be gone in about 9 hours and then it will be down to a quarter of your dose in 18 hours etc. It should be completely undetectable within 3 - 5 days.
The chemicals are detected in oneâs urine for about one week after the dosage is administered. So, when used for nearly two months for a chronic condition, Xanax is found in the body during six weeks after the final dose. How long does it take for Xanax to start working to ensure the âhighâ feeling? As in other cases, it ensures the âhighâ effect within half an hour maximum. As to the action duration, self-reported accounts tell of the duration of 4-5 hours.