There is NO problem with taking
methadone after taking
suboxone.The problem is taking suboxone after being on methadone. That will put you into severe immediate withdrawals. I have much experience with this. I saw what happened to my husband after he took suboxone after methadone and it was the WORST thing I have ever seen. There is no explaining what he went through. I really though he was dying.
I have taken methadone not more than a day after suboxone and was told it is totally fine..and it was no problem, no sickness, nothing. You don't need to wait any time to take the methadone. If it were the other way around I would definetly recommend you waiting at least a few days.
Good luck!