CHARLES BACH / SCIENCE PHOTO LIBRARY CHARLES BACH / SCIENCE PHOTO LIBRARY
Antihistamine tablets and packaging. Antihistamine drugs counteract the effect of histamine, a body chemical that is responsible for many symptoms of an allergic response. Histamines are produced when the body encounters an allergen that is has been sensitized to, such as pollen in the case of hay fever. Other conditions treated by antihistamines can include reactions to animal stings, such as a bee or wasp sting.
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