^rectally is definitively more effective than intranasal for heroin.
I'm not sure what's the relevance of patients on heroin maintence getting up to a gram a day, addicts tolerances get very high- I'm sure there's some that doesn't even hold.
Is that arrow pointing towards me? I never said anything that would contradict your statement, so I don't quite see how the arrow was relevant.
And since you didn't ask any question, I honestly don't see any relevance in you telling us that you don't see how what I wrote is relevant?
But even without asking I'll tell you why I found it remarkable. Not necessarily relevant to the question at hand (which it doesn't have to be for me to mention it in my post), but nonetheless remarkable. It's simply a lot of Heroin is all I was saying. We are not talking about your average street dope here, but pure Heroin and doctors are usually pretty careful when it comes to the maximum daily dosage of opiates.
Maybe you should have asked a question though because we are not talking about maintenance therapy, but about pain management! These patients aren't in the hospital because they had acquired a huge smack habit, but have been suffering such strong and persistant and seemingly therapy resistant pain over years, that they have reached a dosage of 1000mg/d. I found that very impressive.
In my experience tolerance does not build up as fast when a person has a more or less constant plasma level of an opiate, opposed to slamming huge doses as many addicts do.
I am not that familiar with Heroin metabolism, but am aware Heroin itself has a short life. It's still metabolized to at least 2 other opiates (right?), so the effects last over 3-4h (right?) which s about how long oxymorphone acts. The equianalgesic dosage ratio between Heroin and Oxymorphone is about 1:1,5. That's 1500mg oxymorphone per day.
How many Heroin addicts have you met that could slam 1500mg oxymorphone per day (using this because Heroin purity is so unreliable, a bag isn't really a precise amount of Heroin as far as I know).
Maybe I'm making things too easy because Heroin will act shorter and shorter over time due to the metabolites not causing enough opioidergic activity due to the tolerance established by the diamorphine. If that is so and you are aware of it, you could have shared that knowledge. Either way I still think 1g diamorphine per day is very impressive. I haven't seen any patients who received several grams of morphine per day - nothing even close to that. Morphine's half life is 2-3h...
Maybe I'm just naive and I haven't met the type of people you've dealt with in life. Maybe these figures are normal for hardcore junkies.
Also, we should remember that opiates are quite expensive. Financial considerations are always of importance in health care.