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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.
Mirtazapine Side Effects. Commonly reported side effects of mirtazapine include: severe sedation, increased serum cholesterol, drowsiness, constipation, weight gain, insomnia, fatigue, increased appetite, xerostomia, and decreased appetite.