To the best of my knowledge, both chlordiazepoxide and
amitriptyline are both still available by prescription in the
US.
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No. Librium (chlordiazepoxide) is often used to treat alcohol
dependence. You should avoid this combination. Discuss with your
doctor if you have problem to treat your alcohol dependence.
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Xanax is a benzodiazepine (chlordiazepoxide) and will show up as
such. It will not show up as cocaine.