Antihistamines Drugs that block histamine release and reduce the severity of symptoms. In Health Care in America: Trends in Utilization, antihistamines are classified using national drug classification (NDC) class 1944. This therapeutic class does not include nasal corticosteriod inhalants, such as Flonase, which are also used to treat allergies. SOURCE: Health Care in America: Trends in Utilization.
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January 11, 2007
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