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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.
Peak levels and half life of Xanax. Xanax is absorbed quickly in the body and reaches its peak levels in the blood within one or two hours. These plasma blood levels vary depending on the dose taken, but range from 8-37 ng/mL. The half life of Xanax in healthy adults averages 11 hours.