User:Mr. Ibrahem/Fexofenadine

Fexofenadine, sold under the brand name Allegra among others, is an antihistamine medication used to treat allergy symptoms, such as hay fever and urticaria. It is taken by mouth. Effects generally occur within 3 hours and last for about 12 hours.

Common side effects include sleepiness, headache, nausea, and dizziness. Sleepiness is less than with first-generation antihistamines. Other side effects may include allergic reactions. It is classified as a second-generation antihistamine and works as a selective H1-blocker.

Fexofenadine was patented in 1979 and came into medical use in 1996. It is on the World Health Organization's List of Essential Medicines as an alternative to loratadine. It has been avaliable as a generic medication since 2011. In the United Kingdom 30 tablets costs the NHS about 2 pounds while this amount costs in the United States about 9 USD as of 2020. In 2017, it was the 245th most commonly prescribed medication in the United States, with more than one million prescriptions.