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Xanax’s effects kick in at different rates for everyone, but in general, it’s considered fast-acting. Unless you have a tolerance to the drug or take the wrong dose, it usually kicks in within 15 minutes to an hour. The body absorbs Xanax very quickly. It enters the bloodstream and is taken up by the brain just a few minutes after you take it.

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How Long Does Xanax Withdrawal Last? The symptoms of Xanax withdrawal typically appear within 8 to 12 hours of your last dose. If you fail to taper your dose, your withdrawal symptoms will grow increasingly intense.