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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.
Some of the side effects docetaxel treatment can cause include: 1  Anemia (low red blood cell count). 2  Alopecia (hair loss). 3  Peripheral neuropathy (tingling and numbness in the hands and feet).