This treatment is sometimes used, mainly in cases where symptoms are severe and not helped by other treatments. It is done using a series of injections of the allergen causing the rhinitis, in increasing quantities. The idea is that your immune system will become desensitised to the allergen. This means that the allergic response that your body mounts when it is exposed to the allergen in the future is reduced, so improving your symptoms. Another technique is being developed which involves placing the allergen under the tongue. However, this may not yet be widely available.
Mortuaire, G., de Gabory, L., François, M., Massé, G., Bloch, F., Brion, N., ... Serrano, E. Rebound congestion and rhinitis medicamentosa: Nasal decongestants in clinical practice. (2013, June 1). Critical review of the literature by a medical panel. European Annals of Otorhinolaryngology, Head and Neck Diseases , 130(3), 137-144. Retrieved from https:///#!/content/playContent/1--S1879729612001378?returnurl=http:%2F%%2Fretrieve%2Fpii%2FS1879729612001378%3Fshowall%3Dtrue&referrer=https:%2F%2F .