I've done high-level cognitive activities like programming for 5 years of methadone therapy with little to no problems. I took the GRE on methadone therapy and

I've done high-level cognitive activities like programming for 5 years of methadone therapy with little to no problems. I took the GRE on methadone therapy and did better than when I was on no opiates 10+ years ago. Used properly, methadone's side effects can be minimized to almost none in most patients. I tend to get sleepy after lunch, but I honestly can't tell if that's the methadone. Most of the "zombified" methadone users are way overmedicated, usually because this is the state they are seeking.