Types of Allergy Injections: SCIT, Biologics, Steroids, Epinephrine
Four distinct types of injection share the colloquial label 'allergy shot': SCIT (subcutaneous immunotherapy — the only one that is allergen immunotherapy and modifies the underlying disease), biologics (Xolair, Dupixent, Tezspire — anti-IgE or anti-inflammatory but not allergen-specific), depot corticosteroids (Kenalog, Depo-Medrol — symptomatic only, discouraged for routine rhinitis), and epinephrine (EpiPen, Auvi-Q, neffy — emergency rescue only). These are four drug classes that share only the syringe.
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Allergy injections fall into four distinct classes: SCIT (allergen immunotherapy), biologics (Xolair, Dupixent, Tezspire), depot corticosteroids (Kenalog, Depo-Medrol), and epinephrine rescue devices — only SCIT modifies allergen-specific immune tolerance.
The essentials
The search query 'types of allergy injections' intercepts confused patients from at least four therapeutic categories, all of which have been described as 'allergy shots' in casual conversation. Separating them requires a clear taxonomy based on mechanism, indication, and FDA status.
Type 1 — SCIT (Subcutaneous Immunotherapy): The only injection that is allergen immunotherapy per the AAAAI/ACAAI/JCAAI Practice Parameter Third Update (Cox L, Nelson H, Lockey R et al., J Allergy Clin Immunol 2011;127(1 Suppl):S1-S55, DOI 10.1016/j.jaci.2010.09.034). SCIT uses FDA-licensed allergen extracts (19 standardized extracts in the US) to induce immune tolerance through Treg expansion, Th2 downregulation, and IgG4 blocking-antibody induction. A 3-to-5-year course of weekly then biweekly injections — not a one-time treatment. Cochrane meta-analysis (Calderón 2007, 51 RCTs / 2,871 patients) found symptom SMD -0.73 and medication SMD -0.57.
Type 2 — Biologics: Xolair (omalizumab, anti-IgE monoclonal, FDA-approved 2003 for allergic asthma; food-allergy indication added February 16, 2024 based on the OUtMATCH trial, NEJM 2024). Dupixent (dupilumab, anti-IL-4 receptor alpha, FDA-approved March 2017 for atopic dermatitis, October 2018 for asthma). Tezspire (tezepelumab, anti-TSLP, FDA-approved December 17, 2021 for severe asthma in patients ≥12). Biologics treat allergic disease by blocking inflammatory mediators or IgE — they are NOT allergen-specific and do NOT induce immune tolerance.
Type 3 — Depot Corticosteroids: Kenalog-40 (triamcinolone acetonide, FDA-approved February 1, 1965; label includes seasonal or perennial allergic rhinitis only for cases 'intractable to adequate trials of conventional treatment'). Depo-Medrol (methylprednisolone acetate; per FDA label, 80-120 mg may relieve coryzal symptoms for several days to three weeks). These are symptomatic-only treatments. The AAAAI/ACAAI Joint Task Force rhinitis practice parameter discourages single parenteral corticosteroids and contraindicates recurrent administration due to HPA-axis suppression.
Type 4 — Epinephrine Rescue: EpiPen (FDA-approved 1987), Auvi-Q (voice-guided, Kaléo, 2012), neffy (epinephrine nasal spray, ARS Pharmaceuticals, FDA-approved August 9, 2024; pediatric dose approved March 5, 2025). Emergency rescue only — NOT immunotherapy.
Curex's at-home IgE blood test and allergist consultation identify whether allergic disease is the underlying driver before any of these injection categories — SCIT, biologic, depot steroid, or epinephrine prescription — is appropriate.
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Efficacy by allergen — what the data shows
SCIT is the only injection type in this comparison that modifies the underlying allergen-specific immune disease. Cochrane meta-analysis (Calderón 2007) found symptom SMD -0.73 and medication SMD -0.57 across 51 RCTs. Critically, these benefits persist for 3-12 years after a completed course (Durham SR et al., N Engl J Med 1999;341:468-475). The biologics and depot steroids provide symptom relief only during active treatment.
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 youTreatment options side by side
The four types of allergy injections differ radically in mechanism, indication, treatment duration, and disease-modifying potential. The side-by-side comparison below uses the key decision dimensions.
| Treatment | Efficacy | Duration | Cost (5yr) | Convenience | Safety |
|---|---|---|---|---|---|
SCIT (Allergen Immunotherapy) | |||||
Xolair (Omalizumab) | |||||
Dupixent (Dupilumab) | |||||
Kenalog / Depo-Medrol (Depot Steroids) | |||||
Epinephrine (EpiPen/Auvi-Q/neffy) |
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For patients whose allergic rhinitis is IgE-driven and would benefit from disease-modifying immunotherapy, Curex delivers real SCIT allergy shots at home for $129/month — a personalized serum sterile-compounded to USP <797> standards, prescribed by a board-certified allergist, self-administered as one weekly shot with the first dose and every dose change supervised live over Zoom and a prescribed epinephrine auto-injector confirmed on hand. The same disease-modifying immunotherapy as clinic SCIT, without the clinic schedule.
See if at-home shots are right for youFrequently asked questions
What are the different types of allergy shots?
Four types of injection are colloquially called 'allergy shots': (1) SCIT (subcutaneous immunotherapy) — the only one that is true allergen immunotherapy, using FDA-licensed allergen extracts over a 3-5-year course to induce immune tolerance (Cox 2011 Practice Parameter). (2) Biologics — Xolair (omalizumab, anti-IgE), Dupixent (dupilumab, anti-IL-4Rα), and Tezspire (tezepelumab, anti-TSLP) — which treat allergic disease by blocking inflammatory pathways, not by retraining allergen-specific immunity. (3) Depot corticosteroids — Kenalog-40 and Depo-Medrol — symptomatic injections given at primary care offices; discouraged for routine allergic rhinitis by the AAAAI/ACAAI. (4) Epinephrine devices — EpiPen, Auvi-Q, neffy — emergency anaphylaxis rescue, not treatment.
Is Xolair the same as an allergy shot?
No. Xolair (omalizumab) is a biologic monoclonal antibody that binds circulating IgE, preventing IgE from attaching to mast cells and basophils. It is a subcutaneous injection, not an IV infusion, and it is FDA-approved for moderate-to-severe allergic asthma, chronic spontaneous urticaria, and (since February 16, 2024 based on the OUtMATCH trial) for reducing allergic reactions from IgE-mediated food allergies. However, Xolair does NOT induce allergen-specific immune tolerance — it is not immunotherapy. When treatment stops, IgE levels return and disease recurs. SCIT (allergy shots in the immunotherapy sense) induces durable tolerance that persists years after stopping treatment.
Are steroid shots the same as allergy shots?
No. Depot corticosteroid injections — commonly Kenalog-40 (triamcinolone acetonide) or Depo-Medrol (methylprednisolone acetate) — are anti-inflammatory medications that suppress allergy symptoms for days to weeks. They do not modify the underlying allergic disease or induce tolerance to any allergen. The AAAAI/ACAAI Joint Task Force rhinitis practice parameter explicitly discourages routine parenteral corticosteroids for allergic rhinitis and contraindicates repeated use due to HPA-axis suppression. These are fundamentally different from SCIT, which is allergen-specific and disease-modifying over a 3-5-year course.
What is the difference between SCIT and SLIT?
Both SCIT (subcutaneous immunotherapy) and SLIT (sublingual immunotherapy) are allergen immunotherapy — they share the same tolerance-inducing mechanism (Treg induction, IgG4 blocking antibodies). The differences are route and form. SCIT is injected subcutaneously into the upper outer arm; it was traditionally given at an allergy clinic with a 30-minute observation after each visit, but for eligible maintenance patients Curex now delivers the same SCIT at home with a USP <797> compounded serum, a prescribed epinephrine auto-injector on hand, and Zoom-supervised dosing. SLIT is taken under the tongue — either as FDA-approved tablets (Grastek, Oralair, Ragwitek, Odactra) or as compounded drops. SLIT has zero confirmed fatalities worldwide and can be taken at home. The trade-off: SLIT tablets are approved only for single allergens; SCIT can be multi-allergen. Both have comparable efficacy for grass pollen and dust mite per network meta-analyses.
What type of allergy injection is Dupixent?
Dupixent (dupilumab) is an anti-IL-4 receptor alpha biologic monoclonal antibody — it blocks signaling from both IL-4 and IL-13, which are key drivers of type 2 (Th2) inflammation. It is not allergen immunotherapy and does not induce allergen-specific tolerance. FDA approvals include atopic dermatitis (March 2017), allergic asthma (October 2018), chronic rhinosinusitis with nasal polyps, eosinophilic esophagitis, prurigo nodularis, and COPD with an eosinophilic phenotype. Dupixent targets the inflammatory pathway downstream of allergen exposure, unlike SCIT, which retrains the immune system at the allergen-specific level.
When should someone get an epinephrine injection vs an allergy shot?
Epinephrine (EpiPen, Auvi-Q, neffy) is emergency rescue medication for anaphylaxis — it reverses severe allergic reactions by activating adrenergic receptors, and should be used immediately if a patient experiences throat tightness, difficulty breathing, generalized hives, or lightheadedness. WAO anaphylaxis guidance recommends epinephrine IM into the mid-anterolateral thigh as first-line treatment. Allergy shots (SCIT) are a multi-year disease-modifying treatment course administered in a medical office, not an emergency intervention. Patients who have a prescription for an epinephrine auto-injector should still carry it even if they are receiving SCIT, because immunotherapy does not eliminate the risk of anaphylaxis to incidental allergen exposures.
Can allergy injections cure allergies permanently?
No single allergy injection type cures allergies permanently. SCIT (subcutaneous immunotherapy) is the only injection that induces durable disease-modifying remission — and even this is described as sustained remission, not a cure. Durham SR et al. (N Engl J Med 1999;341:468-475) demonstrated that grass-pollen SCIT remission persisted for years after a 3-4 year course ended. Some patients require retreatment if symptoms recur years later. Biologics suppress disease while on treatment but do not modify the underlying sensitization. Depot steroids and epinephrine have no lasting disease-modifying effect. Patients seeking the longest-lasting allergy relief currently available should discuss SCIT or SLIT with a board-certified allergist.
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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.