Injecting allergens under the skin (allergen specific immunotherapy) can reduce asthma and use of medication, but with a risk of severe reactions.
Asthma attacks can be caused by allergies, pollens, cigarette smoke or air pollution and can be fatal. An allergen is a substance that causes an allergic reaction in a person sensitive to it. Allergen specific immunotherapy involves having injections of increasing amounts of the allergen under the skin. It is also called hyposensitisation or desensitisation, and there is a risk of severe allergic reactions. The review of trials found that immunotherapy can reduce asthma symptoms, the need for medications, improve the sensitivity of the lungs and reduce the risk of severe asthma attacks after future exposure to the allergen.
(cochrane review)
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