Ah, yes. What are you treating, and how long have you been on treatment? In my country, they give you a shot once a month, or something like that, and they continue for several years. No guaranteed result, it costs a lot of money compared to conventional treatment, and it involves a risk of severe reactions, so they're reluctant to use it, and if they do, it's usually for pollen. I'm allergic to certain animals, and they're difficult to avoid, because other people spread the allergens.