Hmm... That's interesting. Perhaps the half life may depend on how much you take, and also it seems to build up in your system if you take it frequently, but it's really weird as I've seen studies/articles stating buprenorphine's half life at anywhere from 2 - 75+ hrs. It sounds like some are stating the elimination half-life and some are stating the terminal half-life, which makes things more confusing (not sure which the Temgesic info is referring to).
It's the elimination half life. Temgesic 0.4mg is a pain medication and it is supposed to be taken every 6 to 8 hours, so the dosing is quite different pain management (&recreational) vs. maintenance purposes. This short half life seems to be accurate only in doses below 1mg, some use recreational doses higher than that so they will experience the long acting effects still. I don't know any "dose dependent half life" -compounds other than this, and I aint sure about this either except that the very official (non-english) prescribing information of Temgesic suggests so.
http://www.drugs.com/uk/temgesic-200-microgram-sublingual-tablets-spc-1240.html
^Half life between 2-5hrs according to that but still long term elimination phase4 (whatever it means) 20-25hrs. I think one has to have some knowledge of pharmacokinetics to understand this.
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