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According to the Cleveland Clinic web site, "Antihistamines help relieve symptoms by blocking the action of histamine. Histamine is a naturally occurring substance that is released by the immune system after being exposed to an allergen. When you inhale an allergen, mast cells located in the nose and sinus membranes release histamine. Histamine then attaches to receptors on nearby blood vessels, causing them to enlarge (dilate). Histamine also binds to other receptors located in nasal tissues, causing redness, swelling, itching, and changes in the secretions. By blocking histamine receptors, antihistamines prevent symptoms" (Cleveland Clinic web site 11/10/2008).
So in essence what is occurring is an antihistamine blocks the ability of the body's histamine to attach to the normal receptor to tell the body to have a runny nose, itchy eyes, swelling, etc. They do not inhibit the release of histamine, as this would affect a wide array of other vital body functions that rely on histamine to work properly (such as acid production in the stomach).
What else can I help you with?
Can you mix thyroxine and antihistamines?
can you take antihistamines with thyroxine
Can you take Viagra with antihistamines?
Can you take viagara with antihistamines
What is the effect of antihistamines?
Antihistamines are chemicals that block the effect of histamine, in varying ways. Most antihistamines act on the H1 receptor. Physiologically, antihistamines stop the histamine reaction, and may also induce drowsiness.
What are alterntives to antihistamines?
antihistamines: vitamin C and the bioflavonoid hesperidin act as natural anithistamines.
Can acetaminophen or antihistamines cure chlamydia?
Antihistamines and acetaminophen will not cure chlamydia. You need antibiotics.
Can babies have antihistamines?
No, it is not recommended to give antihistamines to babies without consulting a doctor first.
Do antihistamines have gluten in them?
no
Where can you find antihistamines?
At a pharmacy
Does antihistamines help in diarrhea?
no
Why is caffeine sometimes combined with antihistamines?
Antihistamines are sometimes combined with caffeine to counteract the drowsiness that those drugs cause.
Is there any antihistamines in Advil?
check
Why can't you take antihistamines with emphysema?
Antihistamines can cause dryness of the respiratory tract and may thicken mucus, potentially worsening breathing difficulties in individuals with emphysema. Additionally, some antihistamines can have sedative effects, which might impair respiratory function. It's essential for those with emphysema to consult a healthcare professional before taking antihistamines to avoid exacerbating their condition.
