Corticosteroids work by inhibiting the body’s immune response, and in allergies help to reduce inflammation.
In some cases, where someone requires urgent, fast-acting relief and other medications have not responded, a doctor may choose to issue corticosteroid tablets.
They may also be able to refer you to a consultant allergist for further help if your allergies are having an impact on your life for several months during the year.
Histamine is a chemical which is generated by the immune system.
First-generation antihistamines, such as cyclizine and promethazine, are an older type of treatment; whereas second- and third-generation antihistamines, such as cetirizine and desloratadine, are newer forms.