Allergy Shot for Seasonal Allergies: There Is No Single Shot — Here Is Why
A single allergy shot for seasonal allergies does not deliver clinical benefit — SCIT requires a 60-to-80-injection multi-year course to reach and sustain an effective maintenance dose per Cox 2011 PP3. Patients asking for 'one shot' usually mean the IM depot corticosteroid (Kenalog-40/Depo-Medrol) — a symptomatic product delivering 1–3 weeks of relief that the AAAAI/ACAAI rhinitis Practice Parameter actively discourages. FDA-approved SLIT tablets (Grastek/Ragwitek) are daily oral disease-modifying alternatives requiring only one clinic visit. Curex's at-home allergy shot program turns the full SCIT course into a weekly home injection at $129/month — the disease-modifying outcome without the weekly clinic visit burden.
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There is no single allergy shot for seasonal allergies that provides disease modification — SCIT is a 60-to-80-injection course. A depot steroid shot (Kenalog/Depo-Medrol) exists but is symptomatic, lasts 1–3 weeks, and is professionally discouraged for routine seasonal AR.
The essentials
An allergy shot for seasonal allergies — singular — reflects a question many patients bring to their allergist or search engine: "Is there one shot I can get for my seasonal allergies?" The honest answer is: a single SCIT injection on its own has no documented clinical effect. SCIT efficacy requires reaching and sustaining an effective maintenance dose of allergen extract over a 3–5 year course comprising approximately 60–80 injections. A single injection delivers a sub-therapeutic dose that does not modify the immune program.
Curex's at-home IgE testing identifies the specific seasonal pollens behind a patient's symptoms, with allergist review to determine whether SCIT or an FDA-approved SLIT tablet is appropriate. For eligible patients choosing SCIT, Curex offers a home-based shot program at $129/month — the 60-to-80-injection disease-modifying course, self-administered weekly at home with first-dose Zoom supervision by the prescribing allergist.
The patient asking for "one shot" is usually thinking of one of two things: the IM depot corticosteroid (Kenalog-40 triamcinolone acetonide or Depo-Medrol methylprednisolone acetate) — a real, FDA-approved product that some urgent-care and primary-care offices still offer annually for hay fever. The Depo-Medrol label specifies: "an intramuscular dose of 80 to 120 mg may be followed by relief of coryzal symptoms within six hours persisting for several days to three weeks." This is symptomatic anti-inflammatory suppression — not immunotherapy, not disease-modifying, and not approved for ongoing preventive use. The AAAAI/ACAAI rhinitis Practice Parameter discourages single parenteral steroid administration for routine seasonal AR and contraindicates recurrent administration due to hypothalamic-pituitary-adrenal (HPA) axis suppression and adrenal-axis risk. Kenalog-40 was first FDA-approved on February 1, 1965, and its label lists seasonal AR only among "allergic states intractable to adequate trials of conventional treatment."
The appropriate path when pharmacotherapy fails: the Cox 2011 PP3 indication threshold for SCIT or SLIT is when symptoms persist or worsen despite adequate avoidance and pharmacotherapy, and when IgE sensitization to a clinically relevant allergen is documented. This is the decision point that warrants a board-certified allergist evaluation, not an urgent-care steroid injection.
For patients with single-allergen sensitization (timothy grass or short ragweed monosensitization) who want a disease-modifying option without a multi-year injection series, FDA-approved SLIT tablets offer a legitimate route: Grastek (timothy grass, ALK, ages 5–65) and Ragwitek (short ragweed, Merck, ages 5–65 after 2021 expansion) are taken daily at home after one supervised first-dose clinic visit. Both carry boxed warnings for anaphylaxis and require epinephrine co-prescription. The schedule — one supervised first dose, then daily home dosing — is the closest thing to a practical "minimal-clinic-visit" disease-modifying option for specific pollen allergens.
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Efficacy by allergen — what the data shows
SCIT efficacy for seasonal allergic rhinitis is well-established — but only for patients who complete the multi-injection course.
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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 youFrequently asked questions
Is there a once-a-year allergy shot for seasonal allergies?
The only single-dose injection sometimes given for seasonal allergies is a depot corticosteroid — Kenalog-40 (triamcinolone acetonide IM) or Depo-Medrol (methylprednisolone acetate IM) — which delivers symptomatic relief for approximately 1–3 weeks. This is not immunotherapy and the AAAAI/ACAAI rhinitis Practice Parameter discourages it for routine seasonal AR. There is no FDA-approved "once-a-year" allergen immunotherapy injection. The closest low-visit-burden disease-modifying option is an FDA-approved SLIT tablet (Grastek for timothy grass, Ragwitek for short ragweed), which requires only one supervised first-dose clinic visit and is then taken daily at home.
Why does SCIT require so many shots instead of just one?
SCIT is dose-driven: the immune system requires graduated exposure to escalating allergen concentrations over many months to safely reprogram from IgE-mediated Th2 inflammation toward regulatory T-cell (Treg) mediated tolerance. Starting at a maintenance-level dose without build-up would produce unacceptable systemic-reaction rates — the extract begins at approximately 1:10,000 to 1:1,000,000 of the maintenance concentration for safety. Effective maintenance-dose targets for seasonal pollens per Cox 2011 PP3 include approximately 7 µg Phl p 5 for timothy grass and 7–20 µg Amb a 1 for short ragweed. Reaching those doses from initial dilutions takes approximately 26–28 weekly incremental injections.
What is Kenalog and why do allergists discourage it for seasonal allergies?
Kenalog-40 (triamcinolone acetonide 40 mg/mL, IM injection) is a long-acting depot corticosteroid. It reduces allergic inflammation by suppressing downstream IgE-mediated mast cell and eosinophil activity — providing symptomatic relief for several days to approximately three weeks. It was first FDA-approved on February 1, 1965 for a range of inflammatory conditions including seasonal and perennial AR. Professional allergy societies (AAAAI/ACAAI rhinitis Practice Parameter) discourage its routine use for seasonal AR because: (1) it is not disease-modifying; (2) systemic corticosteroid exposure causes hypothalamic-pituitary-adrenal axis suppression with recurrent use; (3) superior disease-modifying alternatives (SCIT, SLIT) exist. Its label lists AR only among "allergic states intractable to adequate trials of conventional treatment."
What is the Cox 2011 indication for switching from antihistamines to allergy shots?
Cox L et al. (J Allergy Clin Immunol 2011;127[1 Suppl]:S1-S55) state that subcutaneous or sublingual immunotherapy should be considered when symptoms persist or worsen despite adequate allergen avoidance and pharmacotherapy, and when IgE sensitization to a clinically relevant allergen is documented. In practical terms: a patient with moderate-to-severe seasonal AR that is not adequately controlled by a second-generation antihistamine plus intranasal corticosteroid, who has a positive skin prick test or serum-specific IgE to the relevant pollen, meets the threshold for an immunotherapy evaluation. The Practice Parameter also notes that duration of expected allergen exposure (multiple years of seasonal exposure) justifies the multi-year SCIT or SLIT investment.
Are FDA-approved SLIT tablets closer to a single-visit treatment?
SLIT tablets (Grastek for timothy grass, Oralair for 5-grass mix, Ragwitek for short ragweed) require only one supervised first-dose clinic visit; subsequent dosing is daily at home. This makes them the lowest clinic-visit-burden FDA-approved disease-modifying option for seasonal pollen AR — but they require daily compliance at home for 3–5 years and are not single-dose products. All three carry boxed warnings for anaphylaxis requiring the supervised first dose, require co-prescription of epinephrine, and are approved for ages 5–65. They are not available for tree pollens or most weeds other than ragweed; polysensitized patients typically require SCIT rather than a tablet product.
What should I do if antihistamines and nasal sprays stop working for seasonal allergies?
When intranasal corticosteroids and second-generation antihistamines fail to control seasonal allergic rhinitis — particularly when symptoms significantly impair quality of life, sleep, or work across two or more consecutive pollen seasons — the appropriate next step is evaluation by a board-certified allergist. The allergist will confirm IgE sensitization via skin prick testing or serum-specific IgE panel, identify which allergens are driving symptoms, and determine whether SCIT, an FDA-approved SLIT tablet, or biological therapy (for patients with co-existing asthma or CRSwNP) is appropriate. The Cox 2011 PP3 indication threshold explicitly positions SCIT/SLIT as the next step when pharmacotherapy fails.
How effective is the allergy shot for seasonal allergies compared to daily medication?
Cochrane Calderón 2007 (51 RCTs, 2,871 patients) found a symptom SMD of −0.73 for SCIT versus placebo for seasonal AR — a clinically meaningful reduction. Unlike daily medication, SCIT benefits persist 3–12 years after stopping the full course (Durham 1999 NEJM), meaning the 3–5 year investment converts to a decade of potential benefit. The pediatric PAT study (Jacobsen 2007) documented halving of asthma incidence at 10-year follow-up, an effect no antihistamine or intranasal steroid produces. The comparative advantage of SCIT is that it changes the immune program; pharmacotherapy only suppresses symptoms while taken.
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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.