What are Allevia Fexofenadine Tablets. Allevia contains fexofenadine hydrochloride, which is a non-drowsy antihistamine. How to take Allevia Fexofenadine Tablets. Allevia is used in adults and adolescents over 12 years of age to relieve the symptoms of hay fever (seasonal allergic rhinitis) such as sneezing, itchy, runny or blocked nose and itchy, red and watery eyes.
