Not expected: Hydroxyzine when used as an antihistamine or even a sleeping aid does not require tapering. However if you were using it to control anxiety, then a tapering may be required. In large doses, it may slow down your bm and thus it may be the issue for you. Nonetheless your symptoms are unusual and the stomach symptoms may just be coincidental. See doctor if symptoms go beyond a few days or worsen .
Answered 4/8/2016
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