Which of the following symptoms is the most common side effect associated with the older antihistamines? (Please note: all are associated,but one is most common)

Question

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Sedation is the most common side effect associated with the older antihistamines,and it may be accompanied by dizziness,tinnitus,incoordination,blurred vision,and fatigue.Patients who are given first-generation antihistamines should be warned against operating a motor vehicle or signing important documents.The gastrointestinal complaints commonly associated with the antihistamines include anorexia,nausea,vomiting,and constipation.Xerostomia is categorized as an anticholinergic adverse reaction.

Which of the Following Symptoms Is the Most Common Side