Right ok I used to be VERY VERY experienced with Methadone. Here me out...... First off Methadone is dangerious UNLESS you're tolerent!!!! 15mg oral can KILL SOMEONE!!!!!!!!!!!!!!!!!!!!! The doses I talk about below are because my tolerence is so huge, so I DO WORN PEOPLE HERE don't copy what I did.
I am UK here!!!!!!!! We have GREEN LIQUID that is syripy it's 1mg;1ml - theres no rush off Methadone orally unless you have a low-med tolerence then dosing more can even give you a buzz that lasts alll day, yum yum.
Right SUPERQUICK - I went onto methadone 40mg/daily - 1month clean then (just done) I grew a quick tolerence to it (no other opis) I tried to hold out as long as I could - I was close to using but chose to use a benzo ontop of my methadone which helped for another month off heroin. I grew more tolerent taking 40mg per 24hr - I remember waking at 8-9am and driving to my pharmacy for my dose and back, when I got back a bit later it was speedy and motivating (IT WASNT - it's just I was i wd after 24hr). I began using again, methadone morning and heroin night IV - dispite months of telling my DDU I needed upping I "waited till next week...." - over months habit grew I would do either my scripted 40mg+and anotherdose of 40mg+ or it would be Heroin IV. I abused Methadone a few times necking 150mg-200mg for an alright buzz and then using Midazolam snorted/ived(Xan, benzo, gbl I used sometimes insted of mid). The buzz was quiet nice doing this. Now I endedup still at 40mg(+GFJ/DPH/benzos) and anywhere from 4-6 bags of Heroin a day. I still never got upped 0 I waited 40-50mg every 12hr ideally and see from there. Now I went on holiday and all I had was 40 a day of tablets - Psyceptone brand 5mg x8.day - pills. They where burning to the mouth when crushed. My holiday was 2 week and what I did was this 50mg week1 and 30mg week2(+GFJ) - the first week was harder oddly. (h wd left my system?) Pills vs liquid? I pefer liquid it did seem to work a bit faster however pills can be shot (I was going to do this on holday but once I started I would do all of them.) Now Methadone oral UK green is for maintence as it can be measured easy and harder to abuse plus at pharmacies (SUPERVISED) you swallowed it so with pills they can be hidden. The pills I got for hols were 5mg but MARKETED for pain relief. I do see 20-40mg tabs in EU
I would say Heroin IV wd's are alot worse than Methadone Oral - Methadone you can drop 5mg per week or 10% a week IDK and control easier- Heroin carries alot of risk too being a street drug.
Heroin IV is more addictive than Methadone Oral
but dependencey is as bad with both
Now Methadone IV - this was unlike anything, I was unlucky enough to be able to get ampules sometimes each week off a guy I know, could get about 6x 20mg ampules back then per week (providing I gave the guy it in oral). Now I used a 2ml barrel and loaded 40mg into it and did the shot 2hr after oral so both hit, better than Heroin. However overtime Methadone IV made Heroin IV (and YES EVEN FUCKING PHARMACY GRADE DIAMORPINE or 70-90% gear) look a toy. I remember like it was yesterday and it's hard to explain it but I would get 6x 20mg amps now and again or sometimes just a couple and I had saved my weekend oral away. I remember slamming 40mg Methadone and saying "by lord that is truely amazing" - I lost control, and IVed another 40mg straight after then another - being on 120mg Methadone IV, was RUSHY AS FUCK and I mean not 30seconds like fucking' eroin. FROM then on I tried my best to get pills of Methadone or find a way to shoot it insted of oral which does nothing but "hold" - I even tried to see if they would script me it for 1-2 days. I had shot 240mg OxyContin IV which was nice but different - a head high. I did manage to get DIAMORPHINE 4x 10mg and still 40mg wasn't so good as I expected. (cancer leftovers

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Now what is it with theses amps? you can't INJECT METHADONE RIGHT?
QUICKLY I will explain this - ORAL methadone is disigned just to HOLD people it's hard/impossible to shoot although I think there was biodone or a clear oral solution that was 1ml:10mg and people shot it in russia or somewhere - sadly can't do that in the UK so not really - tabs you can depending on them, WHY SCRIPT AMPS? Ok so 20+ years ago, when somene I know was heroin addicted they started Methadone treatment, they USED to do this swap you from H inj to Meth inj or Meth oral, it depends, at fist this person went straight onto 24/7 ampules then over time they weened them onto oral day by day - 20 year later when I knew the person he was on 40mg ORAL 5 days and 2 days were ampules - now the way the amp works is insted of 40mg it's 20mg morning and later on that day another 20mg. These amps where for SC/IM and NOT IV however you COULD IV them but they weren't licenced for that. They were given for needle fixations.
It does sound mad but I spoke with the person and without having them 2 days+ of amps, he'd use H still as it never fulfilled the needle buzz.
It was fun them days but I still had problems getting upped from 40mg and split dosing!!!! as Methadoe was decent at donig it's job!!! I, in the end moved to bupe and the doctor would let me decide more, I went to 16mg bupe - no then 24mg and tapered down to 16 and NOW stable and I plan of 4-8mg/day and then OFF!!!!!!!!!!!