I saw this post right now and I wish to share my little experience with IV methadone syrup (... Damn SYRUP) in a concentration of 5mg/ml, the one I got from the clinic in Italy, luckily it's free all the therapy and if you done things right, clean urine, well... I sometimes use fentanyl patches chewed (12.5ug/h for a total of 2,1mg in the patch, be careful, don't fucking around with fentanyl, really, for medium tolerance person, let's say even if holds 100mg of morphine IV can be deadly either) and that doesn't appear on normal screening, they had to sent some random urine sample on another lab and this process is expensive for the state. So... Almost never they do that. I have the weekly therapy, I was on 160mg/die, but I wanna get rid of it and I'm tapering down, I'm at 85mg/die right now.
All that to let you know my tolerance etc... While I'm taper I'm used to chew one to two patches a day, the more I go down with methadone the more I feel the fent, it's strange cause I always took 1 or max 2 patches everyday for months, maybe the methadone is blocking less while tapering.
But that's another thing.
Tonight I binge on NEP (N-Ethyl-Penterone) a research Chem i sometimes took just for fun, i took a total of 280mg in a 5h time span (don't take my dosage for reference, I had a fast metabolism unfortunately and I had to use more, besides my therapy combo with clonazepam, seroquel (not psychotic, just for strong insomnia) and other things...
Even if Im a decade addict i used IV very rare, I used buprenorphine iv 3-4 times, heroin 3x (never again), and methadone for a total of 3 times with tonight.
I took 10mgs more this morning so I'm at 95mgs + 35mgs IV for the NEP crash which are 7ml of syrup (I hate IV those stuff, and the marks if I mess up something are horrible, I go out 3 times one time... Horrible marks for me) mixed with 13ml of 0.9%NaCl solution (our physiological solution, I'm also a nursing student....) I took an aspirin for headache due to high BP for the NEP, aspirin thin the blood (sorry for bad English) for quite some time, other than that I took 500mg for pain, not 50 or 75 like cardiophatics ppl.
I had my hand shaking, inject in left arm on the median basilic vein, I stayed Inside quite a bit cause I had to inject 20ml of solution with an iv push. Collapse a vein is no good so I took my time while breathing to calm me down, the hand was shaking too much but I did it. It's quite weird... I only iv 35mgs just to take the edge off, I didn't expect any rush, in fact it wasn't, but just to chill and stop clench my poor jaw and relax. Maybe I took too early cause I'm still clenchin but the crash is almost non existent. If I took a patch I didn't had any for next days so I thought "fuck it, I use all sterile stuff, ok I didn't had micron filter cause I'm not used to inject, but I dilute more than 50%, Infact i side the vein the liquid went easily, I prefer taking less methadone but dilute more.
I hope not to mess up something, the hole is clear, disinfected 100x, of course new needle (21 gauge) new siringe, sterile NaCl 0.9% (I heard sometime the word saline refer to this, in Italy saline is 1.8%NaCl,different story).
I hope everything goes well, I didn't had any issue for now, I'm not nodding but very calm.
Now that I tale my story, I don't wanna use it that way again, it's stupid. In my clinic most junkies (the hopeless unfortunately, and hardcore junkies inject PURE SYRUP, with a 20 or 50ml syringe and a 18-16g syringe. For me it's madness, it's almost a plague where the city I live... Heroin sucks it's heavily cutted multiple times with caustic and trash stuff (not fentanyl), shooting a gram doesn't do anything so most addict do this stuff... Ive done it knowing that is the last time, I'm losing interest in opiates, amd I wanna shot a last time this methadone, but really, it provoke a tons of damage doing it everyday, it smash the veins, some collapse and if your lucky without touch those the repair but scar tissue remain and those will be more hard and difficult for an iv access in caso of hospital need (not for this topic, generally speaking) it's damn syrup.
If you want a tip to use it differently, plug it. It's works. It come up fast (5-10min max) with a decent bioavaiability, but always lower than oral, it has almost 90%, orally takes a lot to come up but when it comes it lasts 24-36h of nodding (no tolerance, so stay low! Try 5mg and work up from there).
Well... I guess I go to bed, I hope my experience can help new people who search this topic, even if it's 6 months old, it can be always useful to someone.
Use your brain, start slow and search on site like this before do any stupid things.
Peace
S