Many airborne pollutants that provoke or aggravate allergic reactions may be reduced by air filters. Injections of allergens in gradually increasing amounts stimulate production of a blocking antibody that interferes with the troublesome IgE molecule's interaction with the allergen. This agent prevents or curbs the release of histamine that the IgE would otherwise trigger. Several allergens can be combined in each injection. After that, maintenance shots are given every 2 to 6 weeks, often for many years.
Timing is important for seasonal pollen and mold allergies.
Shots should be planned so the maximum dosage is reached by hay fever season. Shots are given on a year-round basis. Expense of repeated visits to a physician.