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Is Dust Mite Sublingual Immunotherapy Worth It? An ENT in Gangnam, Seoul Explains

Answered by Dr. Kim Yoo Suk, MD · Board-certified otolaryngologist · Former professor, Yonsei & Ajou University · Consultations in English

Who it is worth it for

Sublingual immunotherapy(SLIT) is a treatment that exposes the immune system to small, controlled doses of an allergen through a tablet dissolved under the tongue. Over time, the body becomes less reactive. For house dust mite allergy, our clinic offers the tablet form (Acarizax), which is a non-covered item under Korean national insurance.

It is most worth considering if you:

• Have allergic rhinitis confirmed to be caused by house dust mites
• Still have bothersome symptoms despite medication and avoidance measures
• Want to reduce long-term dependence on daily sprays and antihistamines
• Can take a tablet every day for several years
• Have mild, well-controlled asthma alongside rhinitis (discussed case by case)

How it differs from regular allergy medicine

Antihistamines and steroid sprays control symptoms while you take them. Immunotherapy aims to change the underlying allergic response. Studies show it can reduce symptoms and medication use, with benefits that may continue after treatment ends. It is the only allergy treatment designed to modify the disease rather than mask it.

What to expect

• Testing first: an allergy test must confirm dust mite sensitivity.
• First dose: usually taken at the clinic so you can be observed for a short period.
• Daily routine: one tablet under the tongue each day at home, without eating or drinking for a few minutes afterward.
• Timeline: improvement often begins within several months; a full course is generally about three years.
• Follow-up: regular visits to review symptoms and side effects.

Side effects and limitations

Common side effects are mild itching or swelling under the tongue, in the mouth, or throat, especially during the first weeks. These usually fade. Severe allergic reactions are rare but possible, which is why the first dose is supervised. SLIT is not suitable for everyone, including people with severe or uncontrolled asthma, and it does not help symptoms caused by other allergens or by structural problems like a deviated septum. It also requires consistent daily use, so stopping early reduces its benefit.

What we do at Gangnam Yonsei ENT

Dr. Kim Yoo Suk, a former Yonsei clinical assistant professor and member of the Korean Academy of Asthma, Allergy and Clinical Immunology, has also researched histamine skin reactivity in allergic patients. He first confirms the diagnosis and checks the nose with endoscopy to see whether turbinate swelling or a septal deviation is also contributing. Treatment follows ARIA guideline principles, combining avoidance and allergy medication with immunotherapy when appropriate. If structural blockage remains, turbinate reduction can be considered separately.

Is it practical for expats?

Because the course lasts years, think about how long you will stay in Korea and whether you can continue the same treatment elsewhere. This is worth discussing at your consultation, which can be held in English. See our English-speaking ENT guide, or read whether allergic rhinitis can be cured and when allergy season peaks in Korea.

Related questions

How long until dust mite immunotherapy starts working?

Many people notice some improvement within the first few months, but the full benefit builds gradually. Guidelines generally recommend continuing for about three years to achieve a longer-lasting effect after stopping treatment.

Can children take dust mite sublingual tablets?

Eligibility depends on the specific product approval, age, and the child's asthma status. A doctor will review the child's allergy test results and overall health before recommending immunotherapy and will explain age-related requirements.

Do I still need to control dust mites at home during treatment?

Yes. Washing bedding in hot water, reducing carpets and soft toys, and using mite-resistant covers still help. Avoidance and medication work together with immunotherapy rather than being replaced by it.

This answer is general medical information written and reviewed by an ENT specialist. It is not a diagnosis. Please see a doctor for an examination. In an emergency in Korea, call 119.