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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.
Serious side effects of Arimidex include: 1  Weak or broken bones. 2  Cancer of the lining of the uterus (endometrium) 3  Blood clots or chest pain. 4  Stroke, heart attack, or high blood pressure. 5  Low red blood cell count. 6  Low white blood cell count. 7  Erythema multiforme (Stevens-Johnson syndrome) 8  Cataracts. 9  Liver inflammation.