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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.
Side effects are often observed at the beginning of therapy and usually disappear upon continued use of medication. Possible side effects of Xanax include: 4,6. 1  Drowsiness. 2  Light-headedness. 3  Low energy. 4  Depression. 5  Headache. 6  Confusion. 7  Insomnia. 8  Nervousness. 9  Fainting. 10  Dizziness. 11  Restlessness. 12  Fatigue/tiredness. 13  Impaired coordination. 14  Irritability. 15  Memory impairment.