Sedation: One of the most common side effects of an older antihistamine like Hydroxyzine is drowsiness. This can often be a problem as sometimes people are feeling fine, but things such as reaction time etc. Can be slower. Dry mouth and eyes is another possible side effect.
Answered 3/2/2016
5.8k views
Drowsiness: The main side effect is drowsiness or fatigue. Some people will also experience a dry mouth.
Answered 1/20/2016
5.1k views
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