^ It doesn’t actually prolong the wd, however methadone, obviously an opioid, full Mu agonist, treats and prevents morphine wd-however it has its own wd, and methadone,being a long lasting, and highly potent opioid, has a more gradual withdrawal as mentioned above, however it will eventually hit hard, and at high doses, when it peaks, it feels much like a morphinian withdrawal, except, it seems like it just doesn’t stop-so it is fairly intense and long lasting
However that is with Chronic administration, and specifically methadone maintenance, where the doses are often higher than what the user took/needed, or in any case large doses of this powerful long lasting Mu agonist with a fairly high binding affinity, almost every day? , is bound to produce some pretty intense wd cold turkey
As far as taking it for a couple days to get off heroin, well, it doesn’m really work like that, however if you have to kick, switching to methadone for a few doses, can alter the course of the wd, perhaps making it a tad less intense-however you simply cannot cheat the wd away, it is unfortunately part of the opioid experience