What I'm saying is, given enough fentanyl it's probably going to overpower the meth. 200mg of meth working against 100mg of fentanyl, for example, at the same time sounds like the meth wouldn't really stand a chance in keeping you alive. Then of course theres things like Carfentanil. I mean, it's not like meth is an opioid antagonist. I know from experience that meth/amps can definitely help you in a more mild heroin-induced bout of respiratory depression, but once we start getting into things like high dose Fentanyl/fentalogues I just dont see it working as good for that purpose, and I wouldn't want somebody to see the above post and think "Oh, well even if my meth does have Fentanyl in it, the meth itself will surely save me." I mean, I'm not definitively saying that it can't, but claims like that need some specific scientific source material to back them up, wouldn't you agree? Afterall, this is a harm reduction site...
Edit* for example, would you shoot a gram of Heroin at once simply because you have some meth in your system? I would venture to say you would not. So then why assume that playing with a substance or substances that are at least 50 times as potent as Heroin are free game simply because you're assuming that Meth will be your ultimate savior? Sounds like a false hope that could end fatally..