Is there an acceptable way to rapidly detox from and break addiction to Xanax?

Family member on way to rehab. She is frightened of side effects of withdrawal and wants to know if they treat with other drugs. She has tried tapering. She is an addictive personality – I’d like to get my hands on the dr. (quack) who prescribed xanax, knowing she had abused alcohol and other drugs in the past.
Her main fear of withdrawal is the rapid heartbeat and rise in blood pressure she experiences which was the rationale for the original prescription.

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