Sedating antihistamines examples
Specialised cells and chemicals, which defend your body, can now get access to the area.
While this is a helpful response, it also causes redness, swelling and itching.
An allergen is a substance that is foreign to the body and which can cause an allergic reaction in certain people. In most people, the immune reaction to these foreign substances is normal and appropriate. For example, in people with hay fever, contact with pollen in the nose, throat and eyes triggers the mast cells there to release much more histamine than normal.The histamine binds to special sites (receptors) on other cells, called H1 receptors.This sets off a chain reaction which causes blood vessels in the area to become slightly leaky.(A second type of antihistamine is used primarily for suppressing acid production in the stomach and treating acid-related diseases such as ulcers of the stomach.These antihistamines will not be discussed further.) Antihistamines also may be used to treat motion sickness, insomnia (difficulty sleeping), and anxiety.