Rather than avoiding the allergen, as you normally would, exposure is the treatment.
Allergy immunotherapy is made of the very substance you’re allergic to. It’s basically a standardized extract of certain pollen types, for example, or pet dander, even dust mites.
Small doses given regularly desensitize your immune system. Over time your body learns to tolerate the allergen instead of seeing it as a threat.
There are two types of allergy immunotherapy. Subcutaneous (SCIT) is the original method of injections just under the skin. These are often called allergy shots. The newest form of treatment is sublingual immunotherapy (SLIT), given as a fast-dissolving tablet under the tongue. Subcutaneous extracts and SLIT tablets are approved by Health Canada.