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Hello again and thank you for using JustAnswer. You should definitely not stop the Xanax abruptly, even at this low dose because that can cause withdrawal symptoms. The increase to 20mg/day of the Lexapro can potentially cause an increase in initial adverse effect such as anxiety, restlessness, and feeling jittery, but this will go away within 2-3 weeks as your body adjusts to the 20mg/day dose of Lexapro. So it may be wise to consider staying on the Xanax for another 2 weeks at least and then tapering off Xanax by decreasing the medication at .25mg every week until you are fully discontinued. You do not need to increase the dose of the Xanax, but you should taper off it gradually to help ease your body to rely more on the Lexapro and not "shock" it by the sudden discontinuation of a strong benzodiazepine like Xanax.
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I am going to address your follow-up question here since you posted a new question. You can take Xanax three times a day (spaced out by 8 hours), it will just take longer to taper off of when you are ready. You can still taper off of the Xanax at this dose, it will just take some more time and may be a bit more difficult, but it is still possible. You can also consider the use of the beta blocker as that helps to lessen the physical symptoms of anxiety and panic, so you may not have to rely too much on the Xanax.