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About 5750 years.What I meant was after after ingestion how fast does it start to work and how long does it last. Thank you.

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Wiley Waelchi

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2y ago
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10y ago

Alprazolam half-life average is 11.2 hours, ranging from 6.3 to 26.9 hours in healthy adults. See site reference below:

Half-life period is the time required for the dose to become twice less in the system. But even after being made twice less, the dose is still detectable by tests until it is reduced almost to nothing, half by half. Urine testing can reveal traces of Xanax for up to 14 days in the system.

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14y ago

I take 3-4 of 2mg xanax a day. it really depends. It'll last longer if you take 1 tablet at a time, rather than half now and half later. It calms you down. If you take 1 tablet of the 2mg tri-score...it would last me 3 - 4 hours top.

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15y ago

Xanax (alprazolam) takes 1-2 hours to reach peak plasma level, and has a half life of 12-15 hours.

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12y ago

7 to 28 days!

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12y ago

up to 17 days!

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Q: How long does half a xanax stay in your system?
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Xanax stays in the system of most mammals for about 48 to 72 hours. 1 milligram of Xanax would stay in the system of a cat for about this long.


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