Runny Nose and Sneezing

Antihistamines, such as cetirizine (Zyrtec) chlorpheniramine (Aller-Chlor), diphenhydramine (Benadryl Allergy), fexofenadine (Allegra), and loratadine (Alavert, Claritin) How effective are they?  Very, when symptoms stem from...

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