Sedating antihistamines side effects
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.Examples of controllers include: Other medications, called relievers, are used to alleviate symptoms without affecting the inflammation.They are also called "rescue" medications and in general provide only temporary relief.Histamine is responsible for many of the signs and symptoms of allergic reactions, for example, swelling of the lining of the nose, sneezing, and itchy eyes.Histamine is released from histamine-storing cells (mast cells) and then attaches to other cells that have histamine receptors.Check that the generic name and strength is the same as the medicine doctor recommended or prescribed.
The reason these drugs induce sleepiness is that they are able to cross the blood brain barrier.
Histamine works by attaching itself to these receptors on the surface of cells and thereby causing its effects.
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.