IVing 160MG OF METHADONE EVERY 2 DAYS. Thats one hellish tolerance. You would need so much heroin to even be comfortable
I know a lot of people are going "Wow that's one hell of a tolerance to IV 160mg of Methadone every few 2 days" coming from someone in the medical field (RN in the ER) & also volunteering at a methadone clinic that I participate in 160 mg's is not the uncommon of a dose at all. I let myself get to 110 mg everyday as my dose plus I was IV'ing 48+mgs of Dilaudid a day. 2x 24mg shots... one in the morning before my methadone and one at night late when it would be wearing off a little. Throw in 2 mg of Clonazepam a day & my slew of GI meds for my medical condition (the pain killers are a legal RX that's why I do some many D's. I'm RX'd 6x 8mg's a day of Dilaudid) So my tolerance was easily close to that without a problem. I actually hardly even ever got high from it just helped my Chronic pain. I The methadone makes your tolerance for Opiates insane.
Well the next rant someone is going to say is "Well he was IV'ing his methadone dose" well sure... that matters with drugs like say Dilaudid for example... or even Morphine because both of those drugs have a HORRIBLE bio-availability when taken orally. Both somewhere around 15% actually gets through your liver & to you. Methadone is like a lot like Oxycodone in sense of bio-availability. It's in the 90% +/- 5% range when taken orally, where of course IV is 100% as it bypasses all those pesky body organs that like to eat up certain drugs (maily the morphine family... Hydromorphone, Morphine, Oxymorphone) before they get through your BBB. It's your liver that does it...
But back to the topic whether he took it orally or IV'd the Methadone there is VERY little difference in the effect it would have on his tolerance to Methadone. That just isn't how Methadone works. Funny thing is IV Methadone doesn't even provide a rush (i've been stupid enough to do it in desperation even though I knew it was HORRIBLE for you to even try to inject a little a mount of that liquid, I was just in a horrible flair up and puking up all my Methadone doses I had and needed it in me not to cause me to have withdrawals on top of a bad flare up. That's hospital time when that happens)
It's weird because it even still does the classic Methadone thing where you don't hit a peak from it for hours into it. So there is no rush, the onset really isn't quicker, & its HORRIBLE for your health to IV that liquid. The viscosity is bad even diluted as you said you made it and how you did it. I'm very familiar with mixing fluid especially pain meds with saline bags and hooking them up to patients. The problem with that Methadone is it's viscous and has sugar in it even... they do this on purpose to keep you from IV'ing it. Once or twice like I did was bad enough I lost one of my favorite veins over it just doing it once that time when I was very sick. Your body does not naturally break down that thick syrup in your veins or a lot of the other ingredients besides the methadone in it on it's own. It will collect around your heart valves, your eyes capillaries, etc. You can easily lose a limb, have a pulmonary embolism, blood clot, etc. Anyone else ever considering this please don't. It's very bad for you.
Also working at the clinic it is not uncommon for patients I've seen to be on doses over 300mg because the state I'm from has no laws for MMT clinics to cap doses. A lot of state 180mg is the max. My state is sky's the limit on dosing mg because the only 2 clinics are "for profit" clinics & Methadone has only been available as a drug treatment for addicts for 2 years. That is why there is no cap yet on dosing mg's, I can personally say I know someone on 360mg a day. I think that's evil to do to anyone and should be banned.
I almost feel even the cap of 180 is too high. I was a 1-2 gram a day Heroin user plus 48mg a day Dilaudid user which actually is a lot stronger than 95% of street H. I couldn't cold turkey from that but no joke I was in took at 35mg & to start increasing 5 a day until I'm comfortable. I'm perfect at 60mg a day & If I didn't do what all methadone users do in MMT at first and keep increasing my dose trying to keep myself also "high" on the methadone I think I could have been perfect on just 40mg of methadone.
Methadone is strong and it takes a lot less to maintain and keep you out of w/d than you think. I feel the for profit clinics here just let you go up in does to whatever you want because they know you are screwed and stuck there because your "comfortable" detox would be extremely long if you didn't go AMA (against medical advice ) and create your own much faster taper plan meaning they keep you longer. They honestly cost me $3000 a year out of pocket no insurance is taken nor will mine reimburse me for it. To taper from 60mg to 0 at THERE plan would take like 6 months. I can't imagine from 300mg and up.
So tolerance from IV is no different then tolerance from oral Methadone use...
sorry if I got a little off topic im really stoned and did 16mg of Dilaudid straight to my arm

& then drank my 60mg of Methadone for the day. You ever have a sentence take you like 10 min. to finish because your having to close one of your eyes just to be able to read what your typing without going blurry and nodding out on bluelight trying to help out? Haha totally kidding but I love & hate when your so high on opiates you have to close one eye and open the other to be able to even read words