Anithistamines work by blocking histamine, which can cause allergy symptoms. Side effects of antihistamines may include dry mouth, drowsiness, and more. Follow the links below to find WebMD's comprehensive coverage about how antihistamines work, who should take them, and much more.
WebMD talked to one of the nation's top allergy experts to learn the best ways to control and treat spring allergies this year.
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