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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.
Atarax (hydroxyzine) how long do side effects normally last? Depends...: On which side-effect, how much you took, & your personal susceptibility. If you took a standard dose for hives, say 10-25 mg, and had sleepiness as a side-effect, expect resolution in 8-24 hours. For more specific answers discuss your concern with your physician or other health care provider. ...Read more.