Sedating antihistamines for

Most antihistamines can be bought from pharmacies and shops, but some are only available on prescription.This page covers: Types of antihistamines How to take them Side effects Taking them with other medicines, food or alcohol Who can take them – including pregnancy advice How they work There are many types of antihistamine.Antihistamines are medicines often used to relieve symptoms of allergies, such as hay fever, hives, conjunctivitis and reactions to insect bites or stings.They're also sometimes used to prevent motion sickness and as a short-term treatment for sleeping difficulties (insomnia).Tolerance to the sedative effects of antihistamines can develop quickly.As a result, the longer you take them, the less likely they are to make you sleepy.They accomplished this by blocking the histamine from connecting with its receptors in specific nerve, muscle and glandular types of cells.There are some others as well that play a less significant role.

Antihistamines induce drowsiness by working against histamine, a chemical produced by the central nervous system.For years, the cost of relief for these people was feeling groggy and out of sorts for hours.With non-sedating antihistamines, it is no longer necessary to choose between being free from allergy symptoms and going about your daily business; it is possible to do both.Antihistamines have been available for more than 50 years, and include older, first-generation versions, such as Benadryl (diphenhydramine), Atarax (hydroxyzine), Periactin (cyproheptadine) and Silenor (doxepin).These medications have significant side effects and therefore led to the development of second-generation antihistamines, which include Claritin (loratadine), Zyrtec (cetirizine), and Allegra (fexofenadine), which have fewer side effects.

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