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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.
Other drug interactions include ketoconazole and itraconazole (Sporanox). Side effects of Xanax (alprazolam) include drowsiness, dizziness, insomnia, memory problems, poor balance or coordination, slurred speech, trouble concentrating, and irritability.