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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 belongs to a group of drugs commonly known as first-generation (sedating) antihistamines. It works for itching by blocking histamine receptors. Its anti-anxiety activity is probably due to effects in certain parts of the brain. Atarax also can cause relaxation of skeletal muscles.