Food Allergens: Some of the common food allergens are peanut, tree nut, shellfish, egg and milk. These reactions can be mild, causing a few hives, or life-threatening, causing anaphylaxis. Insect ...

Xyzal (levocetirizine) and Zyrtec (cetirizine) are over-the-counter (OTC) allergy medications. Learn about their key ...

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