Q: My allergy medications aren’t working as well as I would like and my doctor suggested allergy shots. Can you tell me how they work?
A: Allergy shots work like a vaccine. Your body responds to injected amounts of a particular allergen, given in gradually increasing doses, by developing immunity or tolerance to the allergen. There are two phases:
You may notice a decrease in symptoms during the build-up phase, but it may take as long as 12 months on the maintenance dose to notice a lasting improvement. If allergy shots are successful, maintenance treatment is generally continued for three to five years.
Any decision to stop allergy shots should be discussed with your allergist/immunologist.Source: American Academy of Allergy, Asthma and Immunology