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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.
GI problems such as nausea and vomiting are the most common side effects associated with methotrexate, affecting between 20and 65 percent of RA patients who take the drug. While hair loss is a relatively uncommon side effect in patients who take methotrexate at such doses, up to one third develop mouth ulcers, or sores.