A non sedating
Examples of over-the-counter non-sedating antihistamines include the brand names Claritin®, Allegra®, and Zyrtec®.Most are available as just an antihistamine or in combination with other drugs such as decongestants.Prescription non-sedating antihistamines include Clarinex® tablets and the nasal spray, Astelin®.Over the years, many uses of antihistamines have been discovered.Many patients are most familiar with antihistamines used to treat respiratory allergies such as hay fever or as an ingredient in over-the-counter sleeping pills.Others antihistamines, such as meclizine, are often prescribed to prevent the vertigo and nausea that accompany motion sickness.
Antihistamines block histamines, thereby preventing some or all of the allergen's effects, but early antihistamines often caused drowsiness.A non-sedating antihistamine is one that is less likely to cause patients to feel sleepy or tired.Although pharmaceutical manufacturers describe some of their products as non-sedating antihistamines, some patients do experience drowsiness, fatigue, impaired motor responses and concentration difficulties when taking them.On the other hand, some patients experience none of these symptoms when taking sedating antihistamines.Because each patient can react differently, individuals should determine how they react to a non-sedating antihistamine before driving, taking important tests or operating dangerous machinery.
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Many types of antihistamines are available without a prescription.