- Allergy immunotherapy is the only treatment that addresses the underlying sensitization — not just symptoms
- Allergy shots (SCIT) and sublingual drops/tablets (SLIT) are the two main delivery methods
- Treatment typically runs 3–5 years
- Many patients experience lasting remission after completing the full course
- Eligible only after formal allergy testing confirms specific sensitivities
The Fundamental Difference
Every other allergy treatment manages symptoms. Antihistamines block histamine after your immune system has already reacted. Nasal corticosteroids reduce the inflammation that results from allergic reactions. Decongestants open airways that have already swollen. All of these are rearguard actions — treating the consequences of an immune system response that's already been triggered.
Allergy immunotherapy — whether delivered by injection or sublingual administration — works differently. It gradually retrains your immune system to tolerate the allergens that currently trigger reactions. It doesn't mask the response. It changes the response. For many patients, the result is lasting reduction in sensitivity that persists for years after treatment ends.
How Immunotherapy Works
The mechanism is called desensitization or tolerance induction. By introducing incrementally increasing doses of your specific allergens over an extended period, immunotherapy shifts your immune response from IgE-mediated reactivity (the allergic pathway) toward a tolerance pathway characterized by regulatory T cells and blocking IgG4 antibodies.
The process has two phases: a build-up phase lasting roughly 6–12 months where the dose increases weekly or biweekly, and a maintenance phase lasting 3–5 years where you receive the full therapeutic dose monthly. Most patients experience significant symptom reduction within the first year of treatment, with continued improvement through maintenance.
Allergy Shots (SCIT) vs Sublingual Immunotherapy (SLIT)
Subcutaneous Immunotherapy (SCIT) — Allergy Shots
The traditional method. Injections are administered in the allergist's office. You remain in the office for 20–30 minutes after each injection to monitor for reactions. Build-up phase: weekly injections. Maintenance: monthly injections. Most extensively studied and established of the two delivery methods. Covered by most insurance when medically necessary.
Sublingual Immunotherapy (SLIT) — Drops or Tablets
Allergen extracts administered under the tongue, held for 1-2 minutes, then swallowed. Can be done at home after initial medical supervision. More convenient than weekly office visits. FDA-approved sublingual tablets exist for grass, ragweed, dust mites, and a few other allergens. Custom sublingual drops are widely used by allergists but aren't FDA-approved for all allergens.
Who Is a Good Candidate?
Immunotherapy is most appropriate for people whose allergy symptoms significantly affect quality of life despite adequate medication management; who have symptoms that occur during long or multiple allergy seasons; who experience allergy-triggered asthma; who want to reduce long-term dependence on medications; or who are allergic to stinging insects and are at risk of anaphylaxis.
Candidacy is determined by your allergist based on your specific IgE test results, symptom severity, health history, and treatment goals. Testing is a prerequisite — you must know your specific allergens before an immunotherapy program can be designed.
What to Expect During Treatment
| Phase | Duration | Frequency | What Happens |
|---|---|---|---|
| Build-up | 6–12 months | Weekly injections | Dose increases incrementally each visit. Symptoms often improve during this phase. |
| Maintenance | 3–4 years | Monthly injections | Full therapeutic dose maintained. Continued symptom reduction and immune tolerance building. |
| Post-treatment | Ongoing | No treatment | Many patients maintain remission for years after completing the full course. |
The Role of Daily Pollen Tracking During Immunotherapy
Patients undergoing immunotherapy still benefit from daily allergen tracking. During build-up phase, high-pollen days can influence injection timing — some allergists adjust doses downward on extreme pollen days to reduce the risk of local or systemic reactions. During maintenance, tracking helps you understand how your sensitivity threshold is shifting over time — a 400 grains/m³ day that previously floored you might produce only mild symptoms after 18 months of treatment. Tracking that improvement is both informative and motivating.
Track your sensitivity as immunotherapy works.
Anthos monitors your specific allergens daily — so you can see your personal threshold shifting as immunotherapy takes effect.
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Anthos provides general wellness information only. Nothing in this article constitutes medical advice, diagnosis, or treatment. Always consult a licensed healthcare professional before making health decisions.