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Sedating antihistamines side effects

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Antihistamines compete with histamine to attach to these same H1 receptor sites, thereby preventing histamine from binding to them.This action prevents histamine from causing allergic symptoms because the antihistamines that bind do not activate the cells.Although they are the cornerstone of allergy treatment, avoidance measures are not always enough to manage all of the symptoms of nasal allergies (allergic rhinitis).When the symptoms of nasal allergies are mild or intermittent, antihistamines with or without decongestants can help.At this stage, anti-inflammatory medications are required, usually in the form of intra- nasal steroid sprays (sprayed into the nose).The combination of an antihistamine (with or without a decongestant) and a topical nasal steroid spray will usually afford good relief with minimal side effects. For example, leukotriene receptor antagonists, cromolyns and anticholinergic agents are all types of medications used to treat nasal allergies.Examples of controllers include: Other medications, called relievers, are used to alleviate symptoms without affecting the inflammation.

It is mainly through the H1 receptors that histamine causes symptoms of nasal allergy.Drowsiness and reduced mental alertness are particularly common (seen in up to 50% of those taking the medications).Cells that line the blood vessels in the brain regulate which chemicals can enter the brain.Throughout this section on nasal allergy management, the various treatments will be referred to as "controllers" or "relievers" of symptoms.Controllers are used to prevent symptoms by interfering with the underlying causes of the inflammatory response or the actions of chemical mediators.Check that the generic name and strength is the same as the medicine doctor recommended or prescribed.