Nearly 40 million Americans, allegra otc, face seasonal allergies, usually beginning in the spring and can last until the first frost. They are often due to pollen, mold and other allergens in the air. According to the Academy of Allergy, Asthma and Immunology, Americans spend as much as $ 4500000000 a year on medicines and doctor visits to treat allergies.The the first step in treatment is to reduce exposure to allergens. If this is not possible to control symptoms with drugs is often the case.