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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.
This excessive release of histamine produces the associated symptoms of itching, swelling, runny eyes, etc.
This can vary depending on the reason for treating you.
The peak of effectiveness is typically within 1-2 hours after being taken.
Generally, antihistamines have been classified into two groups: All antihistamines work pretty well to reduce symptoms of allergy.
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.
Antihistamines are a group of medicines which act by blocking the action of the chemical called histamine in the body.
Either H1 or H2 histamine receptors can be blocked by medicines, but the group commonly known as antihistamines blocks the H1 receptor.