Weaning from methadone can be difficult, and he'll need at some point to rotate to another opioid.
I'm not a doctor but a patient -- I spent 12 years on 160mg / day methadone, and weaned in 2010-2011.
Here's how I did it.
I reduced my dose about 10% per month until I hit a wall about 40mg/day. I sought medical help, and a pain doctor helped me wean from methadone to another opioid over the next 3 months.
All in all, I spent perhaps 1 year weaning down from 160mg/day.
You've got to go slow, because methadone works in at least 3 ways -- as an opioid, as an NMDA-antagonist, and as a serotonin uptake inhibitor-- ie, it acts on 3 different neurotransmitters.
Also, the half life of methadone is very long -- over 50 hours, perhaps more. So, it will be at least 2 days before his body realizes the dose is lower.
However, I had little trouble during the first 75% reduction. It was the last 25% that required help, along with rotation to a different opioid.
I was glad to come off the methadone -- the drowsiness from that medication was always with me. I never felt like I had enough rest.
However, it was also the best pain medicine I've ever used, and I've used them all.
Do you guys have a family doctor it would not be safe to detox without a doctor supervision there is a substance abuse site here post on that they can help you better on that site i wish you and your husband the best