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Pocahontas
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Reged: 01/28/03
Posts: 214
Loc: North
Drug Plasma half-life vs. urine drug screen
      #145687 - 03/08/04 09:19 PM

Does anyone have any knowledge about blood plasma half life and urine detection of meds?

From the research I have done today, plasma half life is definitely longer but I would think urine detection would be shorter. Am I wrong? Anyone know?

I asked an almost-doctor friend of mine today (grad med school in may) and he is knowledgeable about plasma half life but said he would have to refer me to a PhD Pharmacologist to answer the urine detection question.

I just want to understand!

~pocahontas

--------------------
~Princess Pocahontas

Aim for the moon, for if you miss you will always land amongst the stars ...

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caliban
Stranger


Reged: 03/04/04
Posts: 1
Re: Drug Plasma half-life vs. urine drug screen [Re: Pocahontas]
      #145697 - 03/08/04 09:45 PM

3-5 days will work for almost all drugs...

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night_shade
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Reged: 08/26/03
Posts: 907
Loc: The State of Hockey
Re: Drug Plasma half-life vs. urine drug screen [Re: Pocahontas]
      #145793 - 03/09/04 07:40 AM

From some research I have done, the following are single-dose elimination plasma half-lives:

Fentanyl (Actiq/Duragesic) 6-8 hours
Heroin (diacetylmorphine) 0.5 hours
Hydromorphone 2.5 hours
Morphine 2-3 hours
Dihydrocodeine 4 hours
Hydrocodone (Dihydrocodeinone) 4 hours
Buprenorphine 5 hours
Methadone 15-22 hours
Pentazocine 2-3 hours
Levo-alpha-acetylmethadol (LAAM) 24-36 hours
Tramadol (Ultram) 6-7 hours
Oxycodone (percocet/OxyContin) 3-4 hours
Alprazolam (Xanax) 9-20 hours
Diazepam (Valium) 30-200 hours
Flurazepam (Dalmane) 40-250 hours
Oxazepam (Serax) 3-25 hours
Bromazepam (Lexotanil) 8-30 hours
Chlordiazepoxide (Librium) 24-100 hours
Clonazepam (Klonopin) 19-60 hours
Clorazepate (Tranxene) 1.3-120 hours
Estazolam (Prosom) 8-24 hours
Flunitrazepam (Rohypnol) 18-26 hours
Halazepam (Paxipam) 30-96 hours
Ketazolam 30-200 hours
Lorazepam (Ativan) 8-24 hours
Lormetazepam (Noctamid) 1-12 hours
Nitrazepam (Mogadon) 15-48 hours
Prazepam (Centrax) 30-100 hours
Quazepam (Doral) 39-120 hours
Temazepam (Restoril) 3-25 hours
Triazolam (Halcion) 1.5-5 hours

I'm sure I missed a few...oh, well!

But I think you misunderstand. The half-life is the half-life, it has nothing to do with urine. You may really be asking "how much longer are drugs detectable in a blood test vs urine test?"

The answer is, it depends on the test, how much and for how long you have been using a specific substance. Benzos are usually in your system for much longer than opioids. THC is detectable for up to 30 days (perhaps longer)...what drug specifically are you asking about?

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Never underestimate the predictability of stupidity.

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