I took .5 mg of xanax (alprazolam) for the first time in probably 6 to 9 months. One time only every few months but i wanted to know how long it would be in my system consider i have to take a drug test in about 2 weeks. I am about 5'4 130 pounds. Please help with any information!!
12 Jun 2009
There is no exact number for the time it takes for a drug to be completely eliminated from the body. Drug metabolism is affected by many variables - age, smoking status, other drugs, liver function, kidney function etc.
Most drugs have what is called an "elimination half life" which is the time it takes for the drug to reach half of its pharmacologic activity. For Xanax this is about 11.2 hours.
29 Jul 2011
The mean plasma elimination half-life of Xanax is reported to be 11.2 hours. The full range is from 6.3 to 26.9 hours in healthy adults.
For a drug to be totally eliminated from your system it takes 5.5 times the half life.
If we take the maximum time of 26.9 hours times 5.5, it will be in your system for approximately 148 hours i.e. 6 days, after your final dose.
12 Aug 2013
Sorry, I understand and appreciate the half life information. However, xanax is a benzo that carries a very low concentration post normal half life which can take quite some time to leave your system, especially based on urine testing. I have personal experience with taking just one 2mg tab po which showed positive 3 weeks after. There are sooo many incorrect responses to this question throughout the internet. Consider the source, and the fact that many of these people have nothing better to do than post on things they have no clue about!
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7 answers • 15 Jun 2009
took a .5mg on thursday an may have drug test on sunday afternoon will it still be in the system doing a urine drug test
1 answer • 27 Sep 2009
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If I took 3 zanax and haven't used them in 10 years but I weigh 260 lbs how long will it take to get out of my system for a urine test.
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