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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.
Xanax and Weight Gain. There are many possible side effects of Xanax, and weight gain is a common side effect of the medicine. The risk of weight gain appears to be lower in people taking the drug for anxiety than in people taking it for panic disorder.