<human>: Can you give me the gist of the text in a nutshell?

I recently watched the documentary film Methadonia, which explored how methadone clinics are essentially private profit machines with no incentive to help patients overcome their addiction.  It also exposed just how popular and dangerous it is for methadone patients to take their daily dosage along with benzodiazepines (Xanax, klonopin, etc) to create high more similar to actual heroin.

My brother has a nearly 15-year-long addiction to opiates.  He started with prescription pills and eventually moved to heroin.  He's been going off and on to the methadone clinic for the past five years (although still abusing other opiates along the way).  AFAIC this has zero chance of successful treatment as methadone clinics would seem to have no interest in helping to actually overcome addiction.  This clinic even instructs their ~~patients~~ ~~customers~~ zombies to lie at Narcotics Anonymous meeting about their ~~patient~~ zombie status.

I visited my brother this weekend to give him the DVD.  Over lunch he ordered a 64oz pina colada but before it even arrived he was drooling, nodding off, obnoxiously flirting with our waitress, forgetting what he had ordered.  

I'm told he now has a prescription to xanax for anxiety which would explain the extreme-for-even-him behavior.   The worst part of it though is who issued the prescription, the doctor at the methadone clinic.  Why would this doctor give a known deadly, highly-abused drug combination to a known drug addict?
<bot>: My brother has issues, likely with or without a methadone clinic. But I'd just like to ask of anyone knowledgeable, is simultaneous prescribing methadone and xanax considered medically ethical?