There are two forms of allergen immunotherapy:

1. An injection under the skin (subcutaneous)
2. As tablets or drops dissolved under the tongue (sublingual)

Not every allergen responds to both forms of therapy. Most therapies involve subcutaneous injections.

After the injection/dissolving of the tablets or drops, some patients experience side effects. For instance, some people develop redness and swelling in the area of the injection; others experience a burning feeling on the tongue or in the throat. These side effects should be reported to your doctor: they can be a sign of a life-threatening reaction to the allergen. To minimise risk, patients should remain under observation by a doctor or nurse for at least 30 minutes after treatment.

Allergen immunotherapy is not suitable for all patients. For instance, patients who take certain medications, such as beta blockers, cannot undergo allergen immunotherapy. Certain illnesses may also prohibit the treatment. If you are considering allergen immunotherapy, tell your doctor your complete health history, and tell him or her each and every medication you take.

The success of allergen immunotherapy depends on you: missed appointments can mean serious health problems, so always attend each and every therapy appointment. Even if you notice your allergy problems disappearing halfway through the therapy, it is crucial to continue the therapy for the 3-5 years prescribed by your doctor.

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