Sedating antihistamines and asthma
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.
While there is no cure for asthma or allergies there are treatment options available for individuals suffering with seasonal allergies, in most cases these treatment options can help to control symptoms.Some antihistamines may also have what is known as an antimuscarinic effect.This means that the medicine can also block another type of receptor found on the surface of certain cells.While this is a helpful response, it also causes redness, swelling and itching.
Allergic reactions such as hay fever (seasonal allergic rhinitis) are caused by an oversensitivity or over-reaction of the immune system to a particular allergen.They have a number of uses, but are most often used to treat allergies.