Mr Blonde
Bluelighter
^ I can't speak for Seith, but I'm not dependent. I use once a week, and I know I should take a decent break to get my tolerance down but I just can't be bothered. 
There are other drugs that induce CYP2D6. Phenobarbital is one. Chronic alcoholics also tend to have enlarged livers which produce more of the microsomal enzymes, a problem that has been recognized in medicine for years.
I imagine there would still be a limit to what can be metabolized by a certain enzyme; your liver needs to produce and release these enzymes and these drugs will only boost the levels to a certain extent.
I have some dexamethasone handy actually, I might try this out next weekend.
ETA: Well a lot of CYP charts and articles state that dexamethasone and phenobarb are inducers, but this abstract states that it is 'largely uninducible' by those 'prototypical' inducers. I'm gonna have to do a bit more research before I go necking dexamethasone apparently.

As far as I know, Codeine, unlike Pentazocine and buprenorphine, is a pure Agonist, so as long as our liver could produce the isoenzyme CYP 450 2D6, there is no ceiling effect. ( I read, Glutethimide, a sleeping agent,and Dexamethasone,a corticosteroid, actually the only 2 drugs that boost this CYP 450 2D6, making Codeine being metabolised into Morphine ). So , theoretically, if Codeine at any dose is taken with any of these 2 drugs, it will be all metabolised to Morphine.
There are other drugs that induce CYP2D6. Phenobarbital is one. Chronic alcoholics also tend to have enlarged livers which produce more of the microsomal enzymes, a problem that has been recognized in medicine for years.
I imagine there would still be a limit to what can be metabolized by a certain enzyme; your liver needs to produce and release these enzymes and these drugs will only boost the levels to a certain extent.
I have some dexamethasone handy actually, I might try this out next weekend.
ETA: Well a lot of CYP charts and articles state that dexamethasone and phenobarb are inducers, but this abstract states that it is 'largely uninducible' by those 'prototypical' inducers. I'm gonna have to do a bit more research before I go necking dexamethasone apparently.
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