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Fexofenadine (Allegra): MedlinePlus Drug Information

Tier 1: Established: peer-reviewed research or government health authority
Publisher: MedlinePlus (U.S. National Library of Medicine, NIH) · Published: August 7, 2026 · Accessed: August 7, 2026

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Claims this source supports

  • Fexofenadine (Allegra) is an antihistamine; it works by blocking the effects of histamine, a substance in the body that causes allergy symptoms.
  • Fexofenadine is indicated for allergy symptoms (runny nose, sneezing, red/itchy/watery eyes, itching of nose or throat) and for itching and redness caused by hives.
  • Common side effects include headache, drowsiness/tiredness, and indigestion or nausea.
  • Tell your doctor if you have or have ever had kidney disease; check with a doctor or pharmacist about interactions before combining with other medications.