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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.
Common side effects of Aldactone include. 1  skin rash, 2  headache, 3  dizziness, nausea, 4  vomiting, gas, 5  and. stomach  pain.