There is no valid way to really compare the potency of a full agonist like methadone to a partial agonist like suboxone. In fact I've not found any good comparison/conversion charts that includes suboxone.
others that don't include
http://codeine.50g.com/info/facts.html
http://www.globalrph.com/narcoticonv.htm
I've seen the following posted elsewhere on BL but no link reference included
* 10mg Oxycodone PO
* 15mg Hydrocodone PO
* 4mg Hydromorphone PO
* 20mg Morphine PO
* 90mg Codeine PO
* 0.5mg Suboxone
=====================
#Pain Killer Equivalent Doses (Oral)
1.2mg.............Buprenorphine (Bupe)
200mg............Codeine (Tylenol 2, 3, 4, etc)
30-60mg.........Diacetylmorphine (Heroin) (orally it = morphine, IV/IM/insuffilated it's 2x as strong)
100mg............Dihydrocodeine
30mg..............Hydrocodone (Vicodin, Lorcet, etc)
7.5mg.............Hydromorphone (Dilaudid)
37.5µg............Fentanyl (not sure on this one, anyone know the oral dose equivalence for Fentanyl?)
4mg................Levorphanol (Dromoran)
300mg............Meperidine (Demerol)
10-20mg.........Methadone
30-60mg.........Morphine
20mg..............Oxycodone (Oxycontin, Percocet)
10mg..............Oxymorphone (Numorphan)
200-300mg.....Propoxyphene (Darvocet)
150mg............Tramadol (Ultram, Ultracet)
#Pain Killer Equivalent Doses (IM)
0.3mg.............Buprenorphine (Bupe)
130mg............Codeine (Tylenol 2, 3, 4)
5mg................Diacetylmorphine (Heroin)
65mg..............Dihydrocodeine
N/A.................Hydrocodone (Vicodin, Lorcet, etc)
1.4mg.............Hydromorphone (Dilaudid)
0.1mg.............Fentanyl
2.0mg.............Levorphanol (Dromoran)
75mg..............Meperidine (Demerol)
20mg..............Methadone
10mg..............Morphine
10mg..............Oxycodone (Oxycontin, Percocet)
1.0mg.............Oxymorphone (Numorphan)
N/A.................Propoxyphene (Darvocet)
N/A.................Tramadol (Ultram, Ultracet)
A couple of yrs ago [after 15+ yrs on MMT] I was quickly tapered down to 40mg and switched to 12 mg suboxone [after 3 days on clonodine/benzos] and was OK. But now I'm on .5mg of bupe and essentially feel no different than when I was on 12mg.