NA has a booklet called,
"In Times of Illness," and I think you'll find the answers you need there.
The topic of DRT or Methadone has been discussed here before. Here's an old thread you may find interesting.
http://www.soberrecovery.com/forums/...ml#post1456839
As far as medication for an illness or injury goes...I don't believe there should be any question of a member's clean time unless that member is abusing their medication. NA tells us that we addicts are great ones for manipulating the truth and our bodies can hardly tell the difference between drugs taken for an illness and those we took to get high. Some of us will imagine we're in more pain than we really are just to take more drugs. We have to be very careful.