How Long Does Klonopin Stay In Your System

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Comments Submitted Says:
I took 6 mg of klonopin on friday, how long before it's out of my system. I weigh 230lbs.

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Crystal Says:
Klonopin (active ingredient Clonazepam) can stay in your system from 2 to 4 days.

To learn more click on the link below...

If you have any more questions or concerns, please post back so I can help assist you further.

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steven Says:
I took 12mg of kolonopin how long does it stay in your urine?????

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Crystal Says:
Klonopin stays in your system for up to 4 days, after that you should be ok.

Please post back if you have any more questions or information to add.

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Marguerite Says:
I have taken a 2 mg Klonopin this morning at 4 a.m and have to get a urine test for a volunteer job at 12 pm tomorrow (roughly after 30 hours after I had taken it). Will it show up in my system? I don't normally take it, about once in two months or so.

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Crystal Says:
Marguerite ,

It all depends on your body, everyone is different. Although you do have a better chance of it leaving your system faster, because of the the mgs. If you are concerned I would contact you MD and try to see if they can fax a note stating the reason why you take this drug.

Do you have any more questions or information to add? Please post back if you do.

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brooke Says:
i took a klonapin sat. night the yellow one which i think is the lowest dose. i have a clean system and i have to test today at 4 which it is tues. i weight 115 at 5 foot 2 is it out of my system

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chica Says:
i took 5 2mg klonopins 2day @ 12:30 pm. i've got a pee test next tues. will it be out od my syste by then?!?

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jolly Says:
i have been taking 2mg of Klonopin on a daily basis and i have to take a drug urinalysis test in 7 days.... when do i need to stop taking in order to pass the test?

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mariah Says:
i took 2 1mg kpins on friday, puked a little cause i drank too, then a half a 1mg one saturday and another 1mg one sunday..i had to take a drug test friday at 2:30ish and am terrified that im going to fail for benzasomethin..does anyone know for sure if i would pass?? i dont normally take them maybe like once a month and im 5' 4 and i weigh roughly 125-130 lbs. i would say i have a relativly fast metabolism. someone pleaseeeeee post back!

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JIM Says:

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mict4u Says:
k-pins have a 6 hr half life...50% is still in your body at this will take about 6 more half lifes to get it out,its dose related. more you take the higher the level will be,you should give your body 5-7 dayz and if your an addict at high doses for long periods of tome you may need 2 weeks

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rainbowmeow Says:
i took a 1mg klonopin on monday night and when i had a drug screening on friday, it still showed up in my system. i don't take it regularly, only occasionally for anxiety but since i no longer have a current prescription for it, i had no way to vouch for it being in my system. most people will say it takes 5-7 days, but even though i took it monday night, it showed up clear as day on friday morning as if i had taken it more recently when i did my drug screen through urine.

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Jerkamie Says:
drink a gallon of water, only give 15 ML of urine. DONT GIVE THEM A MORNING URINE, meaning dont wake up, haul ass down there and piss in a cup. Pee 3 to 6 times before you go. Also always give the urin mid stream (start pissing, then give the specim.) If you drink a gallon of water before you go and piss 3 to 5 times before the test. the test will come back adulterated. ESP if you give 15 ml instead of the 30 required. It would be in your best interest if you had the urine supervised as they will think you used sink water as if you drink a gallon of water, thats what you will piss in there eyes. WATER. SImply ask for supervised Urine to be absolutely sure. Because believe me.... I have fast met and it has happend to me. they will think it is a fake specimin. This has worked for me in the past. But. It is not fool proof. DO not expect to be a lifer of benzoes and walk in there and have this work. DOnt expect to smoke a quarter ounce of weed a day and do this and expect it to work. This will work for little oops situations. On another note, they sell powdered urine on the internet with a kit that will keep it @ body temp. For males, they sell a fake penis u pinch and it pumps out urine! fopr females...idk maybe get a condom full of someoens pee and put a piin on the end of your finger. You will have to get creative as to where u are going to put that condom full of pee. (inside).

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mike hancho Says:
you are all horribly wrong. It all depends on what test is used. The most widely used lateral flow immunoassays are calibrated for oxazepam at 300 ng/ml of urine. If it is positive they generally send it off for GC/MS testing. As someone already clearly stated what clonazepam breaks down to it would be redundant for me to do into that. Clonazepam does not metabolize to oxazepam. However, large doses over a period of time can lead to a positive immunoassay, ususally around 781 ng/ml of Clonazepam. The amount of actual non-metabolized clonazepam released in urine is less than 1-2%.
In a chronic low-dose user (less than 3mg per day), many test negative on immunoassay. Single dose users, dependent on dose generally test negative on immunoassays. If an immunoassay is calibrated toward 7-aminoclonazepam and clonazepam (they are available) they would produce a positive.
When expensive GC/MS testing is done due to a positive BZO lateral flow, the lab needs to know to look for Clonazepam and 7-amino clonazepam.
In sum, if someone stays off clonazepam for a few days, the likelyhood of a positive test by most used lateral flow immunoassay would be very slim. So, it would techinally would be a false-negative because the lab could detect it if looking for it with GC/MS. There is much literature online one can review. Academic literature is more accurate than others info. Alot of what people put out there is incorrect and/or incomplete.

The short answer is: Stop taking the drug and wait. It'll be gone in a few days.
The catch is that, like all benzodiazipam category drugs, if you've been taking it for more then a month then you'll need to taper off slowly because of withdrawals (although extremely rare, 2 deaths have been attributed2).


Not only can a drug test detect Klonopin, it can also measure the level, or amount of drug in the body.

Klonopin® (generic: Clonazepam) is a benzodiazapine used to treat anxiety and panic disorders. It has a half-life of anywhere from 18-50 hours, meaning that is how long it takes your body to reduce the amount of clonazepam in your system by half.

If you took three 1 mg tablets, within one to two days, 50% of its major metabolite 7-aminoclonazepam (7-ACLO) will still be in your system, and detectable by urinalysis; within three to four days, 75% of the metabolite will have cleared; within five to six days, 87.5% will have cleared, and so on.

Unfortunately, because the rate of metabolism varies from person to person, the concentration of 7-ACLO measurable in the urine doesn't necessarily decline in a direct linear fashion. You may show peak concentration, the point at which the metabolite is highest and most easily detected, anywhere from the first to the eighth day after taking the drug. Depending on the sensitivity and specificity of the test, one 3 mg. dose of clonazepam is detectable in urinalysis at 14 days; and there is a 75-80% chance of it being detectable at 21 days. It may take 28-30 days for the medication to clear your body completely.1

Most likely, a low-cost employment or other screening test won't be sensitive enough to pick up the one-time use anywhere near that long (the above data came from a forensic study). A drug detection timetable for short-term use of benzodiazapines suggests you should be able to pass a drug test after 5-7 days (the upper end of the time line). This is not a guarantee, however.

Since benzodiazepines are metabolized by the liver and excreted in the urine, drinking a lot of water may help slightly, but won't increase the speed at which your body metabolizes the drug.

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rwgh Says:
i took 3mg of klonipin over 3 days starting Nov. 3rd and smoked 3 joints of marijuana on Nov. 1st. I took a UDS on Dec. 15th. What are the chances of not passing the UDS?

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Jack Says:
I took 20 mg of kpins in to days I have a probation test jan 11 will i pass if o stop taking them now

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Susan Says:
My daughter took 2 .5 mg of clonazepam. Within 1 hour of taking it, she was pulled out of school for drug test bc she fell asleep in class. Does it show up that quickly in a urine test? She only took it 1x ever and has not taken any other drugs.

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Thomas Says:
I took 30 Klonopin in 3 days how long will it show up in a a urine test

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lisa Says:
did you pass your drug test? i ask because i have a similar situation!

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Blondie Says:
I have been taking MS CONTIN 60 mg for chronic pain. I have been taking it for two weeks now. I would like to know how long will it take to get it out of my system for a blood or urinalysis test?

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