Pigweed Mix Allergy Shots: Why Allergists Prescribe the Blend
Pigweed mix allergy shots (SCIT) deliver a multi-species Amaranthus immunotherapy blend because Palmer amaranth, redroot pigweed, prostrate pigweed, and waterhemp share indistinguishable pollen and cross-reactive IgE via Ama r 1. Allergists prescribe a mix — not a single species — because pollen morphology is microscopically indistinguishable and no species-specific allergen exists for Palmer amaranth (WHO/IUIS 2024). A 3-5 year course is standard per AAAAI Practice Parameters (Cox 2011).
Pigweed Mix Allergy Immunotherapy: How It Works
Allergy immunotherapy is the only long-term treatment that re-trains the immune system to stop overreacting to pigweed mix — rather than just masking symptoms with antihistamines or steroids. By gradually exposing the body to controlled doses of pigweed mix allergen, immunotherapy shifts the underlying allergic response and produces relief that often outlasts treatment by 7–10 years.
There are two evidence-based forms of pigweed mix immunotherapy used today, both built on the same desensitization principle but delivered very differently.
of sustained relief after a complete immunotherapy course — the only allergy treatment with proven long-term effect after stopping.
Allergy Shots (SCIT)
Weekly injections of pigweed mix extract in a clinic, escalating over 3–6 months until a maintenance dose is reached. Continued monthly for 3–5 years. Longest clinical track record for pigweed mix allergy.
- Strongest evidence base for severe and polysensitized patients
- Covered by most insurance plans
- Requires 50–100+ in-person clinic visits across the full course
Allergy Drops / Tablets (SLIT)
Daily drops or dissolvable tablets containing pigweed mix extract, held under the tongue at home. Same desensitization principle, delivered without injections. WHO-recognized as an effective form of allergy immunotherapy since 2001.
- Taken at home — no weekly clinic trips, no needles
- Lower systemic reaction rate than allergy shots
- Curex offers prescription pigweed mix immunotherapy drops with allergist oversight
The rest of this page goes deep on allergen-specific immunotherapy with shots — protocol, efficacy data, side effects, and cost. If you’d rather skip the clinic and treat pigweed mix allergy with at-home drops, see how Curex sublingual immunotherapy compares below.
What is Pigweed Mix?
The biology, taxonomy, and clinical fingerprint of Pigweed Mix — the foundation of how SCIT targets it.
Pigweed mix pollen: Amaranthus spp. grains are 20-30 μm, wind-dispersed, and morphologically indistinguishable from Chenopodium under light microscopy.
- Scientific name
- Amaranthus spp. (A. palmeri, A. retroflexus, A. blitoides, A. tuberculatus)
- Family
- Amaranthaceae (includes former Chenopodiaceae per APG IV)Amaranth family
- Type
- Annual weed pollen
- Native to
- North America; multiple species now cosmopolitan
- Allergen proteins
- Ama r 1 (Ole e 1-like, major)Ama r 2 (profilin, pan-allergen)
- Particle size
- 20-30 μm
- Avoidance difficulty
- Nearly impossible
How Pigweed Mix Allergy Presents
Symptoms by body system — useful for distinguishing Pigweed Mix sensitivity from overlapping allergies and infections.
Respiratory
- Seasonal rhinitis with nasal congestion and runny nose Aug–Oct
- Sneezing triggered by outdoor activity during peak pollen hours (midday–afternoon)
- Allergic asthma exacerbation during peak pigweed season
- Post-nasal drip and chronic throat clearing
- Sinus pressure and headache
Ocular
- Itchy, red, watery eyes (allergic conjunctivitis)
- Periorbital swelling on high-count days
- Photosensitivity during peak pollen exposure
- Tearing and eye rubbing urge
Dermal
- Contact urticaria from handling fresh pigweed plants
- Eczema flare during high-count periods in sensitized individuals
- Itching of exposed skin during outdoor activity
Systemic
- Fatigue and reduced productivity during August–October season
- Sleep disruption from congestion and itching
- Reduced exercise tolerance during peak pollen weeks
- OAS-type reactions from profilin sensitization (Ama r 2) to some raw foods
When a patient's fall-season symptoms are driven by Amaranthus sensitization, we prescribe a pigweed mix — not a single species — because Palmer amaranth has no characterized WHO/IUIS allergens of its own. The mix pools A. retroflexus, A. palmeri, and related species whose IgE cross-reacts nearly completely via Ama r 1. It is clinical efficiency born from immunological reality.
When & Where Pigweed Mix Peaks
Allergen intensity by month and by state. Useful for timing SCIT start dates and travel planning.
12-Month Intensity
Peak: mid-August through late September across most US ranges· ~12 weeks of intense exposure; climate change has extended season ~20 days earlier since 1990 (Anderegg 2021 PNAS)
US Exposure Map
10 high-intensity statesWhat Pigweed Mix Cross-Reacts With
Patients sensitized to one allergen often react to others sharing similar proteins. This map shows the documented molecular overlaps.
Pigweed mix pollen shares Ama r 1 (Ole e 1-like) and Ama r 2 (profilin) across the entire Amaranthus genus, producing near-complete intra-genus cross-reactivity; extensive extract-level cross-reactivity also extends to other Amaranthaceae members (Russian thistle, lamb's quarter, kochia, saltbush) via shared profilins and polcalcins (Weber 2007 JACI).
No species-specific allergens; sensitization fully captured by Ama r 1 cross-reactivity
Is SCIT Right for Your Pigweed Mix Allergy?
Answer 5 questions to estimate whether pigweed mix allergy shots are the right option for your fall allergy pattern.
How severe are your late-summer/fall pigweed symptoms (August-October)?
The Pigweed Mix SCIT Protocol
Pigweed mix SCIT uses a non-standardized pooled Amaranthus extract; your allergist will titrate concentration during build-up to reach a therapeutic maintenance dose tolerated without systemic reactions.
Starting from a highly dilute concentration, your allergist increases the pigweed mix dose incrementally. This trains your immune system to tolerate Ama r 1 and Ama r 2 allergens without an exaggerated reaction. With Curex, your first dose and every dose increase are supervised live over Zoom by the prescribing allergist, with a prescribed epinephrine auto-injector confirmed on hand and a brief self-observation afterward. Each dose increase includes a review of local site reactions before advancing.
Once the full therapeutic dose is reached, injections shift to monthly frequency. Most patients notice a meaningful reduction in fall rhinitis and asthma symptoms by the second season. The pigweed mix vial is often compounded with other fall weed extracts (Russian thistle, lamb's quarter, ragweed) for polysensitized patients, reducing total injection volume. Epinephrine auto-injector must be available throughout the entire course.
After 3-5 years of maintenance, many patients maintain clinically significant symptom reduction even after stopping injections. The AAAAI Practice Parameter (Cox 2011) recommends a shared decision at this point based on symptom burden, pollen avoidance feasibility, and patient preference. Some patients with severe disease opt to continue indefinitely.
Extract Concentration Ladder
You progress through each vial during build-up. Concentration increases ~10x per step.
What the Research Shows for Pigweed Mix SCIT
Pigweed mix SCIT lacks a dedicated head-to-head RCT, but evidence from family-level Amaranthaceae and weed-pollen immunotherapy studies supports clinically meaningful efficacy for fall-weed sensitized patients.
- Symptom score reduction — Salsola SCIT (family-level extrapolation)42%Tabar AI et al. 2014, JACI 134:99-105, N=48 (Spanish multicenter RCT for Salsola kali SCIT)
- Weed-pollen immunotherapy medication reduction50%Cox L et al. 2011, JACI 127:S1-55 (AAAAI Practice Parameter — general weed SCIT data)
- US patients reporting improved quality of life on weed SCIT60%Salo PM et al. 2014, JACI 134:350-359 (NHANES data on weed-pollen immunotherapy outcomes)
No published RCT has studied pigweed mix SCIT specifically. The closest controlled evidence comes from the Tabar 2014 JACI Salsola RCT, which showed significant symptom and medication reduction within the same Amaranthaceae family. Observational and practice-parameter data support 3-5 year weed-pollen SCIT as effective for fall rhinitis and asthma. Patients considering pigweed mix SCIT should discuss this evidence gap honestly with their allergist.
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Pigweed Mix SCIT Side Effects
Pigweed mix SCIT side effects follow the standard inhalant SCIT profile — local injection-site reactions are common, systemic reactions are rare, and anaphylaxis is uncommon. With Curex's at-home program, a prescribed epinephrine auto-injector is confirmed on hand and your first dose and every dose change are supervised live over Zoom by the prescribing allergist.
Local reactions
4 documentedSystemic reactions
4 documentedTraditionally SCIT was given only in a clinic, but for eligible maintenance patients Curex enables safe at-home self-administration: a personalized serum sterile-compounded to USP <797> and lot-tested, a prescribed epinephrine auto-injector confirmed on hand before the first injection, and the first dose plus every dose change supervised live over Zoom by the prescribing allergist. The rare systemic reaction almost always begins within the first 30 minutes, so a brief self-observation is advised. No deaths attributable to properly supervised SCIT have been reported in the US in recent years.
SCIT vs Alternatives for Pigweed Mix
Pigweed-sensitized patients have four main options: SCIT (the evidence-based disease-modifying standard), SLIT drops (at-home needle-free alternative), avoidance (nearly impossible with wind-pollinated weed), and daily medications (controls symptoms without modifying underlying sensitization).
| Criterion | At-Home SCIT (Curex)Best | SLIT | Avoidance | Medications |
|---|---|---|---|---|
| Effectiveness | High — family-level RCT support | Moderate — European weed data | Minimal — wind-pollinated | Good symptom control |
| 5-yr cost | $3,500-$15,000 | $1,500-$5,000 | Low | $500-$2,000/yr |
| Duration | 3-5 years | 3-5 years | Ongoing | Ongoing daily use |
| Convenience | Weekly at home during build-up, then monthly — no clinic visits | Daily home dosing | Very difficult Aug-Oct | Daily pills/sprays |
| Safety | Prescribed epi on hand; Zoom-supervised first/changed doses (~30-min onset) | Lower systemic risk | Safe | Safe long-term |
| Lasting effect | Yes — post-treatment | Emerging evidence | No — temporary only | No — symptoms return off meds |
At-Home SCIT (Curex)Best
SLIT
Avoidance
Medications
For patients with multi-year fall pigweed symptoms inadequately controlled by antihistamines, SCIT offers the only disease-modifying option with durable post-treatment benefit. Curex delivers pigweed immunotherapy as a weekly shot you give yourself at home for $129/month — a personalized serum sterile-compounded to USP <797>, your first dose and every dose change supervised live over Zoom by the prescribing allergist, with a prescribed epinephrine auto-injector confirmed on hand — removing the weekly clinic visits of traditional build-up.
What Pigweed Mix SCIT Actually Costs
Most major US insurers cover weed-pollen SCIT including pigweed mix under standard allergy benefits when prescribed by a board-certified allergist; actual out-of-pocket cost depends on your plan's deductible, co-insurance, and whether your allergist is in-network. Prior authorization is commonly required — your allergist's office typically handles this. Curex at-home IgE testing identifies specific pigweed mix sensitization before allergist consultations, eliminating the need for an initial skin-test visit.
Cost range varies by deductible, co-insurance, and clinic.
Verify these codes with your insurer to confirm coverage.
Flat monthly subscription — includes consult, prescription, and at-home dosing for sublingual immunotherapy.
See if you qualifyStop guessing about your pigweed mix allergy. Get a plan.
Take Curex’s 3-minute allergy quiz. A board-certified allergist will review your symptoms and recommend the right immunotherapy path for you — shots or drops.
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Pigweed Mix SCIT — Frequently Asked
Quick answers to the questions patients ask most before starting treatment.
Allergists prescribe pigweed mix because the pollen of all Amaranthus species — including Palmer amaranth (A. palmeri), redroot pigweed (A. retroflexus), prostrate pigweed (A. blitoides), and waterhemp (A. tuberculatus) — is morphologically indistinguishable under light microscopy. Pollen counts are reported as a combined 'chenopod-amaranth' number (Weber 2003). More importantly, Palmer amaranth has no species-specific WHO/IUIS allergens, so the only way to deliver comprehensive immunotherapy for all Amaranthus species is to pool extracts from the well-characterized congeners. The shared Ama r 1 (Ole e 1-like) and Ama r 2 (profilin) allergens mean your immune system treats them as one — so the mix is more thorough, not less precise.
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.