I suffer from dust mite allergy for like 5 years. i'm doing immunotherapy shots for 3 years, and no substantial good results.and drugs don't work.why?

Time to rethink: Allergen immunotherapy may take from 3 to 5 years for completion but most patients feel a moderate response after one year, significant after 2 years. Under any circumstances, after 3 years of shots with no response, it is time to review the diagnosis and the treatment. If your allergist is not open for a thorough review, seek a second opinion.

Ask the allergist: Too many variables to answer this. Your diagnosis or shots could be wrong. You should ask the allergist or physician who is prescribing the shots and if you cannot get a satisfactory answer consider a second opinion with another allergist. Look for allergists certified by the american board of allergy and immunology. A good source is the website of the am academy of allergy: aaaai.Org.