Hi Ralinda, sorry to hear about your husband. Methadone is often used to treat chronic pain, It's a pretty potent panin killer that works particularly well on nerve pain if he can handle the drowsiness. The initial drowsiness will deminish but he may still fall asleep when he's not actively engaged in activity. It can also effect personality, but everyone responds differently.
Read these, they are some of the better chronic pain info on meth, unfortnately you have to dig past alot of addictin management info to find pain managementinfo on. The more you know about CP and these meds the better. IT does have avery long half life and takes 5 days to reach peak and stable blood levels, so day one or two may be uncomfy but it will get better. BY day 5 you pretty much have double what you take each day in your sytem.
You have to adjust this med slower and wait to see the end result on the 5th day.
Cut and paste these addys into your browser
http://www.ampainsoc.org/pub/bulletin/sep00/upda1.htm
This one is really good and talks about blocking NMDA receptors.
http://www.mainehospicecouncil.org/MaineLink/vol2no2/methadone_rediscovered.htm
And you should read this to learn how chronic pain is different than acute pain
http://www.hosppract.com/issues/2000/07/brook.htm
And this is part 2 which talks about drug selection and the difference between adiction and physical depenedence *very important*
http://www.hosppract.com/issues/2000/09/brook.htm
These really will help undestand more about what's goin on, why and what's available.
Good luck and take care, Dave
PS If you need a recipe to relieve constipation, I got one of those too.