hey, actual IV junkie here. you don't calculate the dose by body mass. and 1g oxy = 2g morphine is pure baseless guesswork.
*orally*, you'll get roughly the same *analgesic* effects from either 1 part oxycodone or 1.5 part morphine within a 24-hour interval. snorting, smoking, IV, rectal, all different. BUT that is the *equianalgesic* dose, whereas to ctb you need respiratory depression.
let's just say, fentanyl is a piece-of-shit drug compared to smack. bad high. but it's powerful in suppressing the breathing centers of your brain.
ctb-wise, your best bet is to IV the shit. crush it up. OR, if you've got oxy ER, go for a 80 maybe (if you're opiate-naive). break down the ER mechanism with some soda (coke, fizzy drinks, pop, whatever you call it) and snort it. not really sure if an 80 will do, for some it does. aim for a higher dose just so it doesn't fail.
although I ain't sure if you've just been a massive junkie now. either way it works. cuz I'm pretty sure at one point during active addiction one will want to kill themselves.
quite a bit of the time I opt to living another day just so I can use. but I digress.
yeah, i see that, especially since bioavailability is about 20% when taken orally. I would need about 4000 mg of morphine taken IR to be sure. And i would mix in some benzodiazepines for good measure. thats the best way to go, but it is almost as expansive as N.
BA (bioavailability) is not what determines death. the peak plasma concentration it reaches is. BA is the mathematical integral of plasma conc. over time. there's shit that can last a very long time on a mild conc., like methadone, or fent patches.
and that's why oral opiate ODs ain't a good idea. you want it to hit you hard, reach that peak dose and stay there for a couple minutes, and boom, black out and you dead.
IV fentanyl does a pretty good job at that. although if the OD got reversed (getting narcan'ed) and you happen to have had a seizure in the process, there is some sort of complications. electrotoxicity, brain fog, etc.
Edit: yeah like they said, go for a cocktail. drink/do some benzos BEFORE you take the opis. guaranteed to work if you've little or no tolerance.