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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.
According to experts in the health field the half-life of Xanax is approximately 12 hours. Xanax is a benzodiazepine, so it can be detected during a urine drug testing. This medication is detectable in urine between 3 days and even up to 5 or 6 weeks. Xanax detection times in urine highly depend on the frequency and length of use. For example, if you are an infrequent user, Xanax will go out of your body within a few days.