How antihistamines work. Antihistamines block the effects of a substance called histamine in your body. Histamine is normally released when your body detects something harmful, such as an infection. It causes blood vessels to expand and the skin to swell, which helps protect the body.
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Answer:
Antihistamines block the effects of a substance called histamine in your body.
Explanation:
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Answer:
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Explanation:
How antihistamines work. Antihistamines block the effects of a substance called histamine in your body. Histamine is normally released when your body detects something harmful, such as an infection. It causes blood vessels to expand and the skin to swell, which helps protect the body.