Allergy Immunotherapy in Bengaluru: SCIT, SLIT and Long-Term Allergy Treatment
Updated: Aug 18
If sneezing, a blocked or runny nose, nasal itching, postnasal drip, or itchy watery eyes keep coming back — especially around dust or pollen — allergy immunotherapy (AIT) may be worth discussing with an ENT and allergy specialist. Unlike antihistamines or nasal sprays, which control symptoms as they happen, AIT works to gradually change how the immune system responds to a specific allergen.
AIT means carefully, progressively exposing the body to small, controlled amounts of an allergen that has been confirmed as clinically relevant to the person's symptoms. The two main routes for respiratory allergy are SCIT (subcutaneous immunotherapy, given as injections) and SLIT (sublingual immunotherapy, given under the tongue).
Who Actually Benefits From Immunotherapy?
AIT is considered for selected patients with allergic rhinitis or allergic rhinoconjunctivitis — particularly when symptoms remain troublesome despite standard treatment, when medications aren't well tolerated, or when a patient prefers a treatment that addresses the underlying immune response rather than just the symptoms. One important caveat: a positive allergy test by itself is not a reason to start immunotherapy. The allergen has to be clinically relevant to that person's actual symptoms.
How Does Immunotherapy Actually Work?
AIT promotes a kind of immune tolerance. Over the course of treatment, it can increase regulatory T-cell activity, raise levels of IL-10 and TGF-beta, boost blocking antibodies such as IgG4, and reduce allergen-specific inflammatory responses. This is part of why AIT can offer benefits that outlast the treatment course itself, rather than just suppressing symptoms while it's being taken.
Allergy Testing Comes First
Before immunotherapy is considered, evaluation typically includes skin-prick testing and/or serum-specific IgE testing. But test results are never read in isolation — they're interpreted alongside the clinical history, exposure pattern, seasonality, and the patient's actual symptoms. The goal is to pin down the allergen actually responsible for the disease, not to treat every allergen that shows up positive.
Depending on the individual and the evidence available, immunotherapy may be considered for selected house-dust mites, grass pollens, tree pollens, weed pollens, and other clinically relevant aeroallergens. The evidence base is specific to each allergen and product.
SCIT vs. SLIT: What's the Difference?
SCIT (allergy shots) — given by injection, usually requiring scheduled clinic visits
SLIT (sublingual) — given under the tongue, often more convenient since it doesn't require repeated clinic visits for administration
Both can be effective for selected allergens and licensed products — the right choice depends on the evidence for that allergen, safety, convenience, cost, and personal preference
Comparison of Subcutaneous and Sublingual Immunotherapy: Evaluating Different Methods for Allergy Treatment.
How Long Does Treatment Take?
Immunotherapy is a long-term commitment, not a quick fix. For respiratory allergy, international guidance generally supports a course of at least around three years when the goal is sustained, lasting benefit — though the exact duration is individualised based on the allergen, the specific product, how the patient is responding, and other personal factors.
Does It Reduce the Need for Allergy Medication?
When successful, AIT can reduce both symptoms and the amount of symptomatic medication needed. That said, antihistamines or intranasal corticosteroids may still be needed during treatment — particularly in the earlier stages — and any changes to existing medication should be guided by the treating clinician rather than stopped independently.
Immunotherapy and Asthma
AIT may have a role for selected patients with allergic asthma, particularly once a clinically relevant allergen has been identified. Uncontrolled asthma is an important safety concern that needs to be addressed before immunotherapy is even considered. There's also evidence that a three-year course of SCIT or SLIT may reduce the subsequent risk of developing asthma in selected children and adolescents with certain pollen allergies — though this shouldn't be presented as a guaranteed way to prevent asthma.
Is Allergy Immunotherapy Safe?
AIT has an established safety profile when it's appropriately prescribed and administered, though allergic reactions can still occur. SCIT can cause local and, rarely, systemic reactions including anaphylaxis, which is why it needs to be delivered in a clinical setting equipped to manage that. SLIT commonly causes mild local oral or throat symptoms, particularly when treatment is first starting.
Immunotherapy isn't right for everyone. Important considerations before starting include uncontrolled asthma, certain significant medical conditions, selected cardiovascular circumstances, medications that could complicate emergency treatment, poor adherence, and situations where the risks outweigh the expected benefit. Pregnancy requires individual assessment, and the exact precautions depend on the specific route and product being used.
Allergy Immunotherapy in Bengaluru
For patients in Bengaluru dealing with persistent sneezing, nasal blockage, a watery nose, nasal itching, allergic eye symptoms, or symptoms tied to dust or pollen exposure, an ENT and allergy evaluation can be a useful next step. A structured specialist pathway brings together clinical history, ENT examination, allergy testing, optimisation of conventional treatment, and — where appropriate — assessment for SCIT or SLIT.
When Should You See an ENT Allergy Specialist?
Frequent sneezing or persistent nasal blockage
Recurrent watery nose or postnasal drip
Reduced sense of smell
Repeated 'sinus' symptoms
Sleep disturbance linked to nasal symptoms
Needing allergy medication repeatedly
Symptoms clearly triggered by dust or pollen
Allergic rhinitis occurring alongside asthma
Uncertainty about what a positive allergy test actually means for you
Frequently Asked Questions
Is allergy immunotherapy a permanent cure?
It shouldn't be described as a guaranteed permanent cure. It's a disease-modifying treatment that can provide substantial, and sometimes long-lasting, benefit in appropriately selected patients.
Is immunotherapy better than antihistamines?
They serve different purposes. Antihistamines provide symptom relief in the moment; immunotherapy aims to modify the underlying allergic immune response over time.
Does everyone with allergic rhinitis need immunotherapy?
No. Many patients are well controlled with avoidance measures and standard medication alone.
Can adults receive immunotherapy?
Yes — appropriately selected adults can receive AIT.
Can children receive immunotherapy?
Selected children can receive AIT, depending on their age, diagnosis, the allergen involved, the specific product, and other clinical circumstances.
The Bottom Line
Allergy immunotherapy is more than symptom control. For the right patients, it's an opportunity to actually modify the immune response to a clinically relevant allergen rather than just managing symptoms as they arise. The strongest foundation for treatment rests on correct diagnosis, clinically relevant allergy testing, appropriate allergen selection, evidence-based immunotherapy, ongoing safety monitoring, and long-term adherence.
This article is intended for patient education and professional information. It is not a substitute for individual medical assessment. Protocols, licensed allergens, dosing schedules, age limits, and regulatory requirements vary by country and product — treatment should always follow current local regulations, product information, and specialist clinical judgement.
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