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Is it ok to eat valium and methadone at the same time? - valium more drug_uses

I gotta friend who is in pain, and only bet on methadone, are also taking drugs for anxiety and everyonce take some time. I did not say that the hospital BC / she was afraid that the procedure would be denied to methadone, b / c of recreational drug use during treatment, so my Q is "a negative reaction if to take into account both ?