Non sedating antihistamine in singapore
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.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.However, the exact way that they ease these symptoms is not fully understood.The brain has several key areas which control vomiting.Your doctor or pharmacist may advise or prescribe a particular antihistamine depending on the cause of your allergy and on whether you require a sedating or non-sedating medicine.For example: For other conditions, specific antihistamines may be used.This excessive release of histamine produces the associated symptoms of itching, swelling, runny eyes, etc.
Your doctor or pharmacist will advise you on how to take your medication, including what dose and how often.Note: antihistamines should not be confused with H2 blockers which reduce the production of stomach acid.While both types of medicine block the actions of histamine, they work on different receptors in different systems of the body.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.