I would suspect that because Xanax can be addicting and your son has a history of alcohol and drug abuse, the doctor is hesitant to prescribe anything which has the potential for abuse.
Perhaps Zoloft is not the right med for him - it can take some trial and error to find one that works well on anxiety. Perhaps your son would be well served by going to a psychiatrist, who can work with him to find the right medication that will work the best.
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---Rhi
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