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Monday, October 12, 2009 Hope, Community Member, asks

Q: How long does klonopin stay in your system

Hi, I was wondering how long Klonopin stays in your system? I take up to 1mg daily for anxiety. One of my issues even before I took Klonopin was fatigue. Would it do any good to take it before bedtime? My CNP has mixed opinions on this, and I don't know how long it stays in my system anyway. Any information would be great.

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Answers (1)
Teri Robert, Health Guide
10/12/09 12:52pm



Klonopin has a very long half-life of 20 - 50 hours, depending on age and health. Since the low end of that half-life is under 24 hours, it's usually taken twice a day to keep the amount in the system level. The "normal" dosage range listed for anxiety is .25 to .50 mg twice a day, but keep in mind that this is a recommended dosage, and doctors often need to adjust that some for their patients' needs.


Hope this helps,



jlf, Community Member
3/15/12 7:53pm

i take 2mg klonopin  every nght before bed. how long after i stop taking it will it be out of my system?

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By Hope, Community Member— Last Modified: 08/14/14, First Published: 10/12/09