Allergy Shot Timeline: Month 0 to Year 12 Calendar Explained
The allergy shot timeline per Cox 2011 PP3: Months 0–6 weekly build-up (~24–28 visits); Months 6–12 every-2-week early maintenance; Years 2–5 every-2-to-4-week full maintenance; Year 3 when Durham 1999 disease-modifying remission is robustly established; Year 5 discontinuation decision; Years 7–12 durable post-treatment remission window per Jacobsen 2007 PAT. Symptom improvement: 6–12 months in. Real-world: only 43.9% reach maintenance (Tkacz 2021).
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The allergy shot timeline runs: Months 0–6 weekly build-up, Months 6–12 every-2-week early maintenance, Years 2–5 monthly maintenance. Disease-modifying remission builds from Year 3 and persists 3–12 years after stopping per landmark trials.
The essentials
Patients searching "allergy shot timeline" want dates they can put on a calendar — not visit-by-visit choreography. The direct answer is a five-milestone calendar per Cox 2011 PP3 and two landmark trials.
Curex pairs at-home IgE testing with allergist review to identify the allergens that would justify a 3-to-5-year immunotherapy timeline — the diagnostic step that determines whether the calendar commitment is clinically warranted.
Month 0 — First injection. Approximately 0.05 mL of the most dilute build-up vial. With Curex's At-Home Allergy Shot Kit, this first injection is supervised live over Zoom by the care team; every subsequent dose escalation follows the same Zoom-supervised protocol. A post-injection observation period is standard after every shot.
Months 0–6 — Build-up phase. Per Cox 2011: "The duration of the build-up phase depends on the frequency of the injections but generally ranges from 3 to 6 months." Conventional weekly schedule reaches maintenance at approximately 24–28 injections. During this phase, dose escalates from the most dilute vial (silver, 1:10,000) through the build-up vials to the maintenance concentrate (red, 1:1).
Month 6 — Reaching maintenance. The patient receives the first maintenance-dose injection (0.5 mL of red vial). Injection frequency begins transitioning to every 2 weeks.
Months 6–12 — Early maintenance. Every-2-week injections. Dose stable. Subjective symptom improvement typically begins here — most patients first notice they are sneezing less or using fewer antihistamines during previously symptomatic seasons.
Year 1 complete — Approximately 39 total injection visits across the first 12 months (26 build-up + 13 early maintenance) for the clinic-based protocol; with at-home SCIT the injections are self-administered at home on the same weekly schedule.
Years 2–5 — Full maintenance. Per Cox 2011: "Once the target maintenance dose is reached, injections are spaced to every 2 to 4 weeks and continued for 3 to 5 years." Most programs target every 3–4 weeks at maintenance. Full symptom benefit typically achieved by Year 2–3.
Year 3 — Disease-modifying remission is robustly established. Durham et al. (NEJM 1999;341:468–475) demonstrated that 3–4 years of grass-pollen SCIT produced prolonged clinical remission persisting after discontinuation — "a persistent alteration in immunologic reactivity."
Year 5 — Discontinuation decision. Based on clinical response, patient preference, and the Durham 1999 evidence base. Some patients with severe disease or venom allergy continue longer.
Years 7–12 post-treatment — Durable remission window. Jacobsen et al. (Allergy 2007;62:943–948) — 10-year PAT follow-up — showed that a 3-year SCIT course in allergic children reduced new asthma onset for up to 7 years after treatment ended. The post-treatment remission extends the clinical impact well past the last injection.
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Treatment timeline — phase by phase
The allergy shot timeline maps directly to three named phases with distinct calendar milestones. Planning the calendar commitment — including realistic milestone expectations — is essential for patients deciding whether to start SCIT.
Month 0 to ~Month 6. Escalating doses from 0.05 mL of most dilute vial to 0.5 mL of maintenance concentrate per Cox 2011 PP3. Weekly injections — self-administered at home with Curex, or in-clinic with a traditional allergist program. Zoom-supervised first injection and every dose change. Milestone: reaching the red maintenance concentrate vial at approximately visit 24–28.
Every-2-week early maintenance (Months 6–12), then monthly full maintenance (Years 2–5) per Cox 2011. Disease-modifying tolerance accumulates. Durham 1999 NEJM: 3–4 years of maintenance produces durable remission.
Clinical decision at approximately Year 5. Post-treatment durable remission window: 7–12 years per Jacobsen 2007 PAT (10-year follow-up, adjusted OR 4.6 [95% CI 1.5–13.7] in favor of SIT for asthma prevention).
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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
How long do allergy shots take to work?
Subjective symptom improvement typically becomes noticeable 6–12 months into the allergy shot timeline, during early maintenance. Most patients first notice they are using fewer antihistamines, sneezing less during peak seasons, or experiencing milder asthma symptoms. Full benefit usually becomes apparent by Year 2–3 of the maintenance phase. The immunological changes begin earlier — IgG4 blocking antibodies start rising within 1–3 months of build-up, and regulatory T cells expand within the first 2–4 weeks — but the threshold of clinical benefit most patients notice arrives at early maintenance. Per the Calderon 2007 Cochrane review (51 RCTs, 2,871 patients), the pooled symptom SMD is −0.73.
How many months is the allergy shot build-up phase?
The build-up phase per Cox 2011 PP3 generally ranges from 3 to 6 months depending on injection frequency. Conventional weekly injections take approximately 6 months to reach the maintenance dose — approximately 24–28 weekly visits. Cox 2011 states: "The duration of the build-up phase depends on the frequency of the injections but generally ranges from 3 to 6 months." Cluster immunotherapy (Tabar 2005) compresses build-up to approximately 4–8 weeks by giving 2–4 injections per visit at ≥30-minute intervals. Rush immunotherapy compresses it to 1–3 days with multiple injections over hours. Regardless of build-up schedule, the maintenance phase begins once the target maintenance dose is reached.
When can I stop allergy shots?
The standard recommendation per Cox 2011 PP3 is to continue allergy shots for 3–5 years of maintenance after reaching the full maintenance dose, then reassess. The Durham 1999 NEJM evidence establishes that 3–4 years of grass-pollen SCIT at the maintenance dose produces durable remission persisting after stopping. Stopping significantly before 3 years reduces the likelihood of achieving this durable benefit. The decision to stop at 3 vs 4 vs 5 years is individualized: patients with severe allergic disease or Hymenoptera venom sensitivity often continue longer. Some patients choose to continue indefinitely because their allergies return when they try to stop.
Do allergy shots work after you stop?
Yes — this is the primary advantage of SCIT over pharmacotherapy. Per Durham et al. (NEJM 1999), 3–4 years of grass-pollen SCIT produced prolonged clinical remission persisting after discontinuation. Per Jacobsen et al. (Allergy 2007) 10-year PAT follow-up, a 3-year SCIT course in allergic children reduced new asthma onset for up to 7 years after treatment ended (adjusted OR 4.6, 95% CI 1.5–13.7). The post-treatment durable remission window is estimated at 3–12 years across various allergens and populations. This post-treatment durability is what distinguishes allergen immunotherapy from all pharmacotherapy options — antihistamines, corticosteroids, and biologics only work while you take them.
How long before allergy season should I start allergy shots?
Because build-up takes 3–6 months with conventional weekly dosing before even reaching maintenance, and because meaningful symptom improvement typically begins 6–12 months into treatment, starting allergy shots "just before" a pollen season provides no symptomatic benefit that season. Most allergists recommend starting SCIT perennially (year-round) rather than seasonally, and beginning at least 6–12 months before the allergic season where the patient most wants symptom improvement. Pre-seasonal short-course regimens (build-up before season, no year-round maintenance) exist but are far more common in Europe than the US per Cox 2011. For immediate seasonal symptom relief during the first treatment year, pharmacotherapy continues alongside SCIT.
What is the allergy shot timeline for children?
The allergy shot timeline for children follows the same phase structure as adults per Cox 2011 PP3 (≥5 years of age for SCIT initiation per the practice parameter). The evidence for children is particularly compelling: the PAT (Preventive Allergy Treatment) study by Jacobsen et al. (Allergy 2007) randomized 205 children aged 6–14 with grass and birch pollen rhinoconjunctivitis. Children who completed 3 years of SCIT had significantly lower new asthma onset at both 5-year follow-up and 10-year follow-up, with an adjusted OR of 4.6 in favor of immunotherapy. The earlier in childhood SCIT begins (for confirmed IgE-mediated disease), the more preventive benefit can accumulate before new sensitizations develop.
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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.