Allergies happen when your immune system overreacts to a normally harmless substance like dust or pollen. Hay fever, hives and anaphylaxis are all types of allergic reactions. Many of those affected ...

Antihistamines are a class of drugs that help to treat the symptoms of various allergies. The main difference between first-generation and second- and third-generation antihistamines is that the ...

Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine that is commonly used to treat allergy symptoms, like sneezing, itching, and hives (rashes), motion sickness, and even difficulty ...

The US Food and Drug Administration (FDA) has approved one formulation of azelastine (Astepro) nasal spray for nonprescription treatment of allergies, making it the first nasal antihistamine available ...