What Are Allergy Shots? The Complete Guide to Immunotherapy
Allergy shots (subcutaneous immunotherapy, SCIT) are injections of gradually increasing allergen doses that retrain the immune system to tolerate triggers like pollen, dust mites, and pet dander. A 2007 Cochrane review of 51 RCTs found SCIT reduces symptom scores by 33% and medication use by 36%. Treatment spans 3-5 years but provides lasting disease-modifying benefits. The shot was traditionally given in a clinic, but Curex now delivers it at home for eligible patients at $129/month, with the first injection and every dose change supervised live over Zoom.
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Allergy shots are injections of tiny, increasing doses of the allergens you are allergic to, designed to retrain your immune system over 3-5 years. They are the only FDA-recognized disease-modifying treatment for IgE-mediated allergic disease.
Allergy Shots: The Disease-Modifying Treatment for Allergic Disease
Allergy shots — clinically called subcutaneous immunotherapy (SCIT) — are the only FDA-recognized treatment that changes how your immune system responds to allergens, rather than just suppressing symptoms. Instead of taking a daily antihistamine that wears off each night, SCIT gradually retrains your immune system to stop overreacting to triggers like grass pollen, dust mites, cat dander, and stinging insect venom.
The treatment works by injecting tiny, precisely measured doses of the allergens you are sensitive to directly beneath the skin. Starting at extremely low concentrations, doses increase over weeks and months until you reach a therapeutic maintenance dose your immune system can tolerate. Meta-analyses of 51 randomized controlled trials found SCIT reduces rhinitis symptom scores by 33% and medication use by 36% compared to placebo.
Before starting any immunotherapy, identifying your specific IgE triggers through comprehensive allergy testing is essential. Curex offers at-home allergy test kits covering 40+ allergens via a simple finger-prick blood test, with results in about a week — giving your allergist the diagnostic blueprint they need to build your personalized treatment plan.
SCIT is FDA-approved for allergic rhinitis, allergic conjunctivitis, allergic asthma, and stinging insect hypersensitivity. Contraindications include uncontrolled asthma, concurrent beta-blocker use, and severe immunodeficiency. When successful, disease-modifying benefits can persist 3-12 years after treatment ends — a meaningful advantage over symptomatic medications.
Allergy shots are the only treatment that modifies the underlying allergic disease, not just the symptoms. Studies show 50-80% of patients achieve clinically meaningful improvement that may last years after stopping treatment.
How Allergy Shots Retrain Your Immune System
Allergy shots work by exploiting a fundamental property of the immune system: it can be taught. In allergic individuals, the immune system incorrectly identifies harmless proteins — grass pollen, dust mite particles, cat Fel d 1 — as dangerous invaders, triggering IgE antibody production and a histamine cascade with every exposure. SCIT introduces those same proteins in controlled, escalating microdoses, gradually shifting the immune response from Th2-driven allergy toward regulatory T-cell-mediated tolerance.
Identify Your Specific Triggers
Allergy testing identifies which proteins your immune system has incorrectly flagged as dangerous. This determines the exact allergen extracts that go into your personalized injection vials. Without accurate testing, the treatment cannot be properly targeted.
Expose the Immune System Gradually
Starting at 1/1,000 to 1/10,000 of the maintenance dose, injections introduce your specific allergens subcutaneously. Each dose is small enough to avoid triggering a full allergic reaction but sufficient to begin reprogramming immune responses. Doses increase incrementally every 1-2 weeks during the build-up phase.
Build Blocking Antibodies
As treatment progresses, IgG4 blocking antibodies rise 10-100x above baseline, intercepting allergens before they can reach IgE-armed mast cells. Simultaneously, FOXP3+ regulatory T cells expand, actively suppressing the allergic inflammatory response at the cellular level.
Achieve Lasting Immune Tolerance
After 3-5 years of consistent treatment, the immune system has fundamentally changed its response to your allergens. Clinical studies demonstrate that disease-modifying benefits persist 3-12 years after stopping injections — unlike antihistamines, which provide no lasting change.
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The Allergy Shot Treatment Schedule: Build-Up to Long-Term Benefit
Allergy shot treatment proceeds in two distinct phases. The build-up phase establishes your maintenance dose through progressively increasing injections. The maintenance phase sustains your therapeutic dose for 3-5 years while your immune system builds lasting tolerance. Most patients begin to notice symptom improvement within 3-6 months, with maximum benefit typically reached around 12-18 months of consistent treatment.
Injections begin at an extremely dilute concentration and increase in dose and concentration at each visit. AAAAI practice parameters define the standard build-up as 8-28 weeks depending on the protocol used. Conventional build-up involves weekly injections; cluster and rush protocols accelerate the timeline by giving multiple injections per visit.
Once you reach your target maintenance dose, injection frequency drops to once every 2-4 weeks. This phase lasts 3-5 years and is where the majority of immune tolerance is built. Most patients report meaningful symptom improvement within the first year of maintenance. Missing appointments during this phase typically requires dose adjustment.
After completing a full 3-5 year course, clinical evidence shows benefits persist well beyond the treatment period. A landmark study by Durham et al. (NEJM, 1999) demonstrated sustained efficacy 3 years after discontinuing grass pollen immunotherapy. Eng et al. (Allergy, 2006) confirmed 12-year durability in a long-term follow-up cohort.
Same proven results. No clinic visits.
Curex's at-home allergy shots deliver the same allergen desensitization as clinic SCIT — for a flat $129/month, with no clinic visits and no facility fees.
See if at-home shots are right for youAllergy Shots vs Other Treatments: What the Evidence Shows
Allergy shots are the only disease-modifying treatment option in the table below — meaning they change the underlying immune response rather than temporarily suppressing symptoms. Antihistamines and nasal steroids provide real relief but offer no lasting benefit once stopped. SLIT tablets are FDA-approved for specific allergens and can be taken at home. The right choice depends on your allergen profile, lifestyle, and treatment goals.
| Treatment | Efficacy | Duration | Cost (5yr) | Convenience | Safety |
|---|---|---|---|---|---|
Allergy Shots (SCIT)Best | 50-80% of patients achieve clinically meaningful improvement; disease-modifying with lasting benefits | 3-5 years | $3,000-10,000 | Weekly build-up then monthly maintenance with a 30-min observation; traditionally clinic-based, now self-administered at home with Curex, first dose and dose changes supervised live over Zoom | Local reactions in 30-80% of patients; systemic reactions in 0.1-0.2% per injection; epinephrine available on-site |
Sublingual Drops (SLIT) | Comparable efficacy to SCIT for well-studied allergens; strong European evidence base of 60+ RCTs | 3-5 years | $2,340-3,500 | Daily drops at home; no clinic visits, no observation period, no needles | Primarily oral/local reactions; systemic reactions very rare; no epinephrine requirement at home |
SLIT Tablets (FDA-approved) | FDA-approved for grass, ragweed, and dust mite; high evidence quality for covered allergens only | 3-5 years | $5,000-15,000 | Daily sublingual tablets at home; first dose given in-office with 30-minute observation | Mild-to-moderate local reactions; systemic reactions rare; not suitable for patients with multiple allergen sensitizations |
Antihistamines (OTC) | Symptom relief only; no disease modification; benefits cease when medication stops | Ongoing (no end point) | $300-1,500 | Daily oral pill; no office visits required | Well-established safety profile; sedation with first-generation products; no long-term immune benefit |
Nasal Corticosteroids | Highly effective for nasal symptoms; no disease modification | Ongoing (no end point) | $500-2,000 | Daily nasal spray; no office visits; easy to use | Minimal systemic absorption; local nasal dryness and nosebleed possible; safe for long-term use |
- Efficacy
- 50-80% of patients achieve clinically meaningful improvement; disease-modifying with lasting benefits
- Duration
- 3-5 years
- Cost (5yr)
- $3,000-10,000
- Convenience
- Weekly build-up then monthly maintenance with a 30-min observation; traditionally clinic-based, now self-administered at home with Curex, first dose and dose changes supervised live over Zoom
- Safety
- Local reactions in 30-80% of patients; systemic reactions in 0.1-0.2% per injection; epinephrine available on-site
- Efficacy
- Comparable efficacy to SCIT for well-studied allergens; strong European evidence base of 60+ RCTs
- Duration
- 3-5 years
- Cost (5yr)
- $2,340-3,500
- Convenience
- Daily drops at home; no clinic visits, no observation period, no needles
- Safety
- Primarily oral/local reactions; systemic reactions very rare; no epinephrine requirement at home
- Efficacy
- FDA-approved for grass, ragweed, and dust mite; high evidence quality for covered allergens only
- Duration
- 3-5 years
- Cost (5yr)
- $5,000-15,000
- Convenience
- Daily sublingual tablets at home; first dose given in-office with 30-minute observation
- Safety
- Mild-to-moderate local reactions; systemic reactions rare; not suitable for patients with multiple allergen sensitizations
- Efficacy
- Symptom relief only; no disease modification; benefits cease when medication stops
- Duration
- Ongoing (no end point)
- Cost (5yr)
- $300-1,500
- Convenience
- Daily oral pill; no office visits required
- Safety
- Well-established safety profile; sedation with first-generation products; no long-term immune benefit
- Efficacy
- Highly effective for nasal symptoms; no disease modification
- Duration
- Ongoing (no end point)
- Cost (5yr)
- $500-2,000
- Convenience
- Daily nasal spray; no office visits; easy to use
- Safety
- Minimal systemic absorption; local nasal dryness and nosebleed possible; safe for long-term use
For patients who want the disease-modifying benefits of allergy shots without the weekly clinic trips, Curex delivers the shot itself at home for $129/month — a personalized serum sterile-compounded to USP <797>, matched to your specific IgE test results and prescribed by a board-certified allergist. Your first injection and every dose change are supervised live over Zoom, a prescribed epinephrine auto-injector is confirmed on hand, and dosing escalates gradually week by week, making safe at-home maintenance possible for eligible patients.
See if at-home shots are right for youFrequently asked questions
What are allergy shots made of?
Allergy shots are made of purified allergen extracts — proteins derived from the environmental substances you are allergic to, such as grass pollen proteins, dust mite fecal particles, cat Fel d 1 protein, or Hymenoptera venom. These extracts are mixed with a diluent containing human serum albumin (a protein stabilizer), phenol (0.4% as a bacteriostatic preservative), and normal saline as the carrier. Glycerin (50% v/v) stabilizes the extracts during storage. Each patient's vial is custom-compounded by their allergist based on their specific allergy test results. There are no steroids, no mercury, and no live organisms in allergen immunotherapy shots.
Who is a good candidate for allergy shots?
Good candidates for allergy shots are patients with IgE-mediated allergic disease — confirmed by skin prick testing or specific IgE blood testing — who have symptoms that are not adequately controlled by medications, or who want to reduce their long-term dependence on daily antihistamines and nasal sprays. FDA-approved indications include allergic rhinitis, allergic conjunctivitis, allergic asthma (when controlled), and stinging insect (Hymenoptera) hypersensitivity. Contraindications include uncontrolled asthma (FEV1 less than 70% predicted), concurrent beta-blocker therapy (which can make treating anaphylaxis difficult), and severe cardiovascular disease or immunodeficiency. Your allergist will assess your candidacy based on clinical history, testing results, and current health status.
How long do allergy shots take to work?
Most patients begin to notice meaningful symptom reduction within 3 to 6 months of starting allergy shots, though individual timelines vary. Initial improvement often appears during the build-up phase as doses approach maintenance levels. Full therapeutic benefit — the maximum symptom reduction — typically occurs at 12 to 18 months of consistent treatment. The Calderon et al. Cochrane review (2007) found pooled symptom score improvements of 33% and medication reductions of 36% across 51 randomized controlled trials. Continuing through the complete 3-5 year maintenance course maximizes the likelihood of durable, long-lasting benefit beyond the treatment period.
What are the side effects of allergy shots?
The most common side effects of allergy shots are local injection-site reactions — redness, swelling, and itching at the injection site — occurring in 30-80% of patients. These are normal and expected, typically resolving within 30-60 minutes. Systemic reactions (hives, sneezing, mild asthma symptoms affecting areas beyond the injection site) occur in 0.1-0.2% of injections and are managed with antihistamines or epinephrine. Severe anaphylaxis is extremely rare, estimated at less than 1 per 1 million injections per AAAAI surveillance data. A 30-minute observation after each injection captures most systemic reactions, which is why it remained the traditional clinic standard; with Curex, eligible at-home patients keep a prescribed epinephrine auto-injector confirmed on hand, have their first injection and every dose change supervised live over Zoom, and follow a gradual week-by-week escalation overseen by a board-certified allergist.
Do allergy shots work for everyone?
Allergy shots do not work equally for all patients or all allergens. Clinical trial data suggests 50-80% of patients with allergic rhinitis achieve clinically meaningful improvement. Efficacy is strongest for grass pollen, ragweed, dust mites, and cat dander, and very high for stinging insect venom allergy (95-98% protection rate). Patients with multiple sensitizations, mold allergy, or food allergy may see more variable results. A meaningful minority of patients — estimated 10-20% — do not respond sufficiently to complete the full course. Factors associated with better outcomes include younger age at start, fewer concurrent sensitizations, and consistent adherence to the injection schedule throughout the 3-5 year course.
Can allergy shots cure allergies permanently?
Allergy shots cannot guarantee permanent cure, but clinical evidence shows disease-modifying benefits that persist well beyond treatment completion. Durham et al. (NEJM, 1999) demonstrated that patients who completed 3 years of grass pollen SCIT maintained significantly reduced symptoms for at least 3 years after stopping injections — compared to patients who received placebo. Eng et al. (Allergy, 2006) found benefits persisting up to 12 years post-treatment in a long-term follow-up cohort. The PAT study (Moller et al., JACI, 2002) showed SCIT even prevented new asthma onset in allergic rhinitis children at 7-year follow-up. Results vary by individual, allergen type, and adherence to the full treatment course.
Are allergy shots worth the time commitment?
Whether allergy shots are worth the time depends on the severity of your allergy symptoms and your treatment goals. Patients with moderate-to-severe allergic rhinitis, allergic asthma, or life-threatening stinging insect allergy typically see the strongest value proposition: 3-5 years of weekly then monthly clinic visits in exchange for years or decades of reduced symptoms and potentially reduced medication dependence. Clinical trial evidence supports that allergy shots reduce both symptom scores and rescue medication use significantly. The time commitment is real — particularly during the build-up phase, which requires 1-3 visits per week for several months. For patients with scheduling constraints or needle anxiety, sublingual alternatives may offer a more feasible path to the same immunological goal.
What happens if you stop allergy shots early?
Stopping allergy shots before completing the recommended 3-5 year maintenance course reduces the likelihood of achieving durable, long-term benefit. Patients who discontinue during the build-up phase before reaching maintenance dose may lose most of the protective immune changes that have occurred. Those who complete at least 2-3 years of maintenance are more likely to retain meaningful benefit after stopping. Clinical guidelines generally recommend completing the full 3-5 year course before discontinuing. If you miss appointments, your allergist may need to reduce your dose before resuming — particularly during the build-up phase, where gaps greater than 7 days typically require a step back in the dosing schedule per AAAAI protocols.
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Read moreGet your allergy shots — without the clinic.
Curex's flat $129/month covers end-to-end at-home immunotherapy — a personalized serum compounded to USP <797> sterile standards, board-certified allergist oversight, and one weekly injection you give yourself at home. No clinic visits, no facility fees. HSA/FSA eligible.
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This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. Content reviewed by board-certified allergists at Curex.