House Dust Mite Sublingual Immunotherapy (HDM SLIT)

HDM SLIT involves giving a controlled amount of house dust mite allergen extract under the tongue every day. Regular exposure gradually trains the immune system to become less sensitive to house dust mites. Over time, this can reduce the allergic inflammation responsible for nose, eye and respiratory symptoms.

The first dose is usually given in the clinic under medical observation. Subsequent doses are taken daily at home according to the prescribed treatment plan. Depending on the product used, the dose is placed under the tongue and held there briefly before being swallowed.

HDM SLIT is an effective treatment for appropriately selected children with house dust mite allergic rhinitis or allergic rhinoconjunctivitis.

Many children experience:

• Less sneezing, nasal blockage and nasal itching

• Fewer itchy or watery eye symptoms

• Better sleep and daily comfort

• Less reliance on antihistamines and steroid nasal sprays

• Better overall control of their respiratory allergies

Children who also have house dust mite-related asthma may experience an improvement in their asthma symptoms. However, SLIT does not replace prescribed asthma preventer or reliever medication unless the doctor advises a change.

Improvement is gradual rather than immediate. Some children begin to notice a reduction in symptoms within the first two to six months, although the response varies between individuals. Completing at least three years of treatment is important, as this increases the likelihood that the benefits will continue after SLIT has been stopped.

HDM SLIT is generally very safe. The most common side effects are mild reactions around the mouth and throat, including:

• Itching or tingling inside the mouth or around the lips

• Itching of the throat or ears

• Mild swelling or discomfort in the mouth

These symptoms usually occur during the early stages of treatment. They are generally temporary and improve as the immune system becomes accustomed to the treatment. If the symptoms are troublesome, your doctor may recommend an antihistamine or adjust the treatment.

Reactions affecting other parts of the body are uncommon. Severe systemic reactions and anaphylaxis are very rare. Families should nevertheless follow the dosing instructions carefully and report any unexpected or persistent symptoms to their doctor.

HDM SLIT requires:

• One dose under the tongue every day

• Consistent treatment, even when symptoms have improved

• Regular follow-up appointments, usually every three months

• Continued use of other allergy medicines when needed

• Ongoing efforts to reduce house dust mite exposure

During follow-up visits, the doctor will review:

• Improvement in nose, eye and respiratory symptoms

• Sleep and daily functioning

• The amount of other allergy medication required

• Side effects and treatment tolerance

• Whether any changes to the treatment plan are needed

Daily adherence is essential. Frequently missing doses may reduce the effectiveness of treatment.

The minimum recommended treatment duration is three years. Some children may continue treatment for up to five years, depending on their response, treatment goals and the advice of the allergy specialist.

This is a long-term treatment. Families should consider whether daily dosing and regular follow-up can be maintained before deciding to begin.