Non sedating antihistamines otc
These antihistamines have significant side effects termed “anticholinergic”, which may include dry mouth, sleepiness and urinary retention. Because of the side effects of these medications, they are generally considered to be too sedating for routine daytime use. Antihistamines are the most commonly used medications to treat allergic rhinitis. Older antihistamines, called first-generation antihistamines, include diphenhydramine (Benadryl), chlorpheniramine (Chlor-Trimeton), and hydroxyzine (Atarax/Vistaril). These are the symptoms of hay fever, also known as allergic rhinitis.
Therefore, this article will only discuss the newer antihistamines as described below. Newer antihistamines, called second-generation anthistamines, include cetirizine (Zyrtec), fexofenadine (Allegra, generics), desloratadine (Clarinex), and loratadine (Claritin, Alavert, various generics) and Xyzal (levocetirizine). Leukotrienes are chemicals released from a variety of allergic and immune cells, and may cause allergy symptoms, primarily nasal congestion. Because antihistamines block the action of histamine, most histamine-causing symptoms are treated by antihistamines.
These newer antihistamines tend to have fewer anticholinergic side effects, and therefore are termed “low-sedating” or “non-sedating”. Montelukast (Singulair), is not an antihistamine, but rather an antileukotriene medication.