Decongestant Vs. Expectorant

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Histamine is one of the chemicals released when antibodies overreact to allergens. It is the cause of many symptoms of allergic rhinitis. Antihistamines can help relieve:

  • Itching, sneezing, and runny nose (unless combined with a decongestant, antihistamines do not work well for relieving nasal congestion).
  • Other allergy symptoms unrelated to rhinitis, including hives and some rashes

If possible, patients should take antihistamines before an anticipated allergy attack.


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