Non sedating allergy

In some individuals the rash persists over weeks and months and this chronic form may require specialist intervention to allow the condition to be appropriately treated.

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Skin sensations local itching or burning sensation, flushing and a disagreeable heat.

Stomach pain acid secretion increases; small intestine contracts with crampy pain Respiratory - nose swelling, congestion, sneezing and wheezing.

There are two kinds of histamine receptors, H1 and H2.

These receptors both receive histamine as a messenger, but the meaning conveyed is different.

Sensitivities vary widely from one person (or other animal) to another.

So concludes a new study published in the current issue of Journal of Allergy and Clinical Immunology in which researchers compared 18 previous trials investigating antihistamine-caused sedation levels in 1,500 people between ages 8 and 81.

Most of the studies reviewed used doses that were twice the recommended amount -- 50 milligrams -- of diphenhydramine, the active ingredient in Benadryl and other first-generation "sedating" allergy medications.

An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. In technical terms, an allergen is an antigen capable of stimulating a type-I hypersensitivity reaction in atopic individuals through Immunoglobulin E (Ig E) responses.

Most humans mount significant Immunoglobulin E responses only as a defense against parasitic infections.

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