Jack,
My wife is an administrative RN, unit manager - and supervised
the BPRU Methadone outpatient clinic at Hopkins Bayview for over 10 yrs.
This was for addicts to come in for their daily or 2x/day methadone doses.
We're well aware of the consequences.
But it has been proven effective in the cases where it has been used to treat PN.
I've known about it (treatment for PN) for about 10 yrs.
It is usually used as a last resort when most other meds have failed to yield results.
It is inexpensive and works very well for some.