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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.
A: Atarax (hydroxyzine) reduces activity in the central nervous system and also acts as an antihistamine. Atarax is used to treat anxiety and tension, to relieve the skin symptoms of allergies, to control nausea and vomiting, and as part of anesthesia.: Atarax (hydroxyzine) reduces activity in the central nervous system and also acts as an antihistamine. Atarax is used to treat anxiety and tension, to relieve the skin symptoms of allergies, to control nausea and vomiting, and as part of anesthesia.