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The most common Atarax side effect is drowsiness which is usually temporary and may disappear within a few days or when the dosage is reduced. Other important Atarax side effects that may occur include dry mouth, twitches, tremors and convulsions.
Needless to say, the longer you use or abuse Xanax, the longer it will take to cleanse your system from it. Side Effects of Xanax Xanax is a medication with many side effects. 1  Even after using it for a relatively short period, Xanax can cause: 2  Problems with cognitive functions. 3  Speech problems. 4  Confusion. 5  Disorientation. 6  Headache. 7  Dizziness.