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How Long Will Percocet Take To Show In Urine Test?

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Posted on Thu, 27 Aug 2015
Question: How long will it take for Percocet to show in urine test? And how many milligrams is needed to detect?
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Answered by Dr. Dr. Matt Wachsman (42 minutes later)
Brief Answer:
tricky....

Detailed Answer:
Oh, how long is about an hour maybe slightly less. The rest is basically impossible to give exact numbers but easy to say parameters. First, let us discuss half life. Percocet gets in over about an hour or so, then all of it is in. Then, the key thing is that ONLY the blood going thru the liver is cleansed of drug. So.... half of it gets run thru in a certain amount of time....then the amount in the body decreases by half, then the same amount of time later it goes to 1/4, then 1/8, then 1/16th....
Let us say the peak is 100 times the minimum detectable for one 5 mg tablet, the half life is about 3 hrs and the minimum detectable is 1.
3 hr its 50
6 hr its 25
9 hr 12.5
12 hr 6.25
15 hr 3
18 hr 1.6
21 0.8 and not detectable anymore
Let us then say someone took 30 mg... or 6 times... or 600 peak level
3 hr is 300
6 hr is 150
9 hr is 75
12 hr is 37.5
15 hr is 18.75
18 hr is about 10
21 hr is about 5
24 hr is about 2.5
27 hr is about 1.25
and 30 hrs to be undetectable....
since it is generally about 3 to 5 days to clear out percocet and be undetectable I'm not too far off with these estimates.
(it's actually more like 4 to 5 hr not 3 for the half life. more like 3 in a very young person, more like 6 if there is heart or liver failure).

Certainly a 5 milligram tablet will be detectable. If it is much less than that, I have to wonder how/why/what circumstance this could possibly occur in. It just will be detectable for slightly less time (30 goes to 15, then 7.5 then 4....3 half lives.... 12 hrs) about 12 hrs less time detectable for 5 millgram versus 30 milligram.

THIS IS FOR IMMEDIATE RELEASE oxycodone. If you take a drug like oxycontin that dissolves over 12 hrs, you need to add at LEAST the 12 hrs into the equation... it is 3 to five days with 12 to 24 MORE hrs for the pill to dissolve fully.
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Follow up: Dr. Dr. Matt Wachsman (27 minutes later)
Thank you for your response. So if I have 2 10mg Percocet tablets and take one at 1am tomorrow morning and the 2nd at 6am tomorrow morning; my urine test is around 115 tomorrow. Will Percocet be detected? I'm taking as prescribed but keep getting false negatives.
doctor
Answered by Dr. Dr. Matt Wachsman (2 hours later)
Brief Answer:
I just don't see how it can't

Detailed Answer:
ohhhhh.... unless they aren't testing for it!
the usual "narcotic" test does NOT detect oxycodone! Has to be a test dedicated specifically for oxycodone, otherwise it's built for heroin and does not reliably detect oxycodone.
Note: For further guidance on mental health, Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Dr. Matt Wachsman

Addiction Medicine Specialist

Practicing since :1985

Answered : 4214 Questions

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How Long Will Percocet Take To Show In Urine Test?

Brief Answer: tricky.... Detailed Answer: Oh, how long is about an hour maybe slightly less. The rest is basically impossible to give exact numbers but easy to say parameters. First, let us discuss half life. Percocet gets in over about an hour or so, then all of it is in. Then, the key thing is that ONLY the blood going thru the liver is cleansed of drug. So.... half of it gets run thru in a certain amount of time....then the amount in the body decreases by half, then the same amount of time later it goes to 1/4, then 1/8, then 1/16th.... Let us say the peak is 100 times the minimum detectable for one 5 mg tablet, the half life is about 3 hrs and the minimum detectable is 1. 3 hr its 50 6 hr its 25 9 hr 12.5 12 hr 6.25 15 hr 3 18 hr 1.6 21 0.8 and not detectable anymore Let us then say someone took 30 mg... or 6 times... or 600 peak level 3 hr is 300 6 hr is 150 9 hr is 75 12 hr is 37.5 15 hr is 18.75 18 hr is about 10 21 hr is about 5 24 hr is about 2.5 27 hr is about 1.25 and 30 hrs to be undetectable.... since it is generally about 3 to 5 days to clear out percocet and be undetectable I'm not too far off with these estimates. (it's actually more like 4 to 5 hr not 3 for the half life. more like 3 in a very young person, more like 6 if there is heart or liver failure). Certainly a 5 milligram tablet will be detectable. If it is much less than that, I have to wonder how/why/what circumstance this could possibly occur in. It just will be detectable for slightly less time (30 goes to 15, then 7.5 then 4....3 half lives.... 12 hrs) about 12 hrs less time detectable for 5 millgram versus 30 milligram. THIS IS FOR IMMEDIATE RELEASE oxycodone. If you take a drug like oxycontin that dissolves over 12 hrs, you need to add at LEAST the 12 hrs into the equation... it is 3 to five days with 12 to 24 MORE hrs for the pill to dissolve fully.