Allergy Shots in Chicago and How Immunotherapy Works

Reviewed by Otto R. Garcia MD Internist at Hermosa Medical and Diagnostic Center

Last updated: September 2026

Key takeaways

- Allergy shots are the only treatment that changes the allergy itself rather than masking symptoms.

- Build up runs 3 to 6 months. Maintenance runs 3 to 5 years.

- Most people notice real improvement between month 6 and month 12.

- Benefit commonly persists for years after the course ends which no daily antihistamine does.

- You wait 30 minutes in the office after every injection because that is when reactions occur.

Start with the comparison because it settles most of the decision before any explanation is needed.

Antihistamines and nasal steroids suppress the reaction. Allergy shots retrain the immune system so the reaction gets smaller and stays smaller after treatment stops. That difference is the whole argument and it is also why the commitment is measured in years rather than weeks.

Chicago makes the case stronger than most cities. Tree pollen runs late March through May. Grass runs May through July. Ragweed starts in mid August and does not stop until the first hard frost which commonly falls in late October. Add dust mite and cockroach allergen in older housing stock and a sensitized person here has very few clear weeks in the year.

Allergy treatment options compared

 

Not sure whether your symptoms are allergic at all? Testing answers it in one visit and results are read the same day. Call 773 772 8876 or book an appointment online.

How immunotherapy actually works

Immunotherapy introduces the allergen you react to in gradually increasing controlled doses until the immune system stops treating it as a threat. Over months production of blocking antibodies rises regulatory immune cells increase and the cells that release histamine become less reactive. This is genuine immune modification and not symptom suppression.

An allergic reaction starts when the immune system misclassifies a harmless protein. It makes immunoglobulin E antibodies specific to that protein and those antibodies sit on mast cells throughout the airways skin and gut. On the next exposure the allergen cross links them and the cell releases histamine. That release is the sneezing itching swelling and congestion.

Immunotherapy shifts the response away from that pathway. Production of immunoglobulin G4 rises and those antibodies intercept the allergen before immunoglobulin E can bind it. Regulatory T cells increase and actively dampen the response. Mast cells and basophils become progressively less reactive.

That is why benefit persists after treatment ends. No symptomatic medication produces the same durable result because none of them touch the underlying mechanism.

Testing comes first and a positive test is not the same as an allergy

You cannot treat what has not been identified so testing always precedes immunotherapy. Skin prick testing places small amounts of allergen extract on the skin and results read in 15 to 20 minutes. Blood testing measures allergen specific immunoglobulin E and is used when skin testing is not possible.

Skin prick testing. Fast covers many allergens in one session and remains the standard. Antihistamines must be stopped for several days beforehand because they suppress the reaction and produce false negatives. Tell the clinic what you take when you book.

Specific immunoglobulin E blood testing. Used when extensive eczema dermatographism or an inability to stop antihistamines rules out skin testing. ImmunoCAP is one widely used laboratory platform. Blood testing is unaffected by medication.

Here is the nuance that matters most. A positive test means sensitization and not necessarily clinical allergy. Plenty of people test positive to allergens that cause them no symptoms at all. The treatment list is built from tests that match your actual symptom pattern and its seasonal timing. That is a clinical judgment and not a mechanical transcription of a result sheet.

Our guide to what to expect at an allergy test covers the visit in detail.

Who is a good candidate and who is not

Immunotherapy suits people with testing confirmed allergy whose symptoms persist despite consistent antihistamine and nasal steroid use whose symptoms last more than a few months a year or who have allergic asthma triggered by identified allergens. For insect sting allergy it is strongly protective and can be lifesaving.

It also suits people who simply do not want to take a daily medication for the next thirty years with no end point. Where breathing symptoms are part of the picture our internal medicine team assesses lung function alongside the allergy workup.

Caution or delay applies in several situations. Severe or poorly controlled asthma must be stabilized first because systemic reaction risk is higher and our guide to hidden asthma triggers covers what usually needs fixing before that point. Beta blocker use needs discussion because these medications can blunt the response to epinephrine if a severe reaction occurs. Certain autoimmune conditions and active malignancy are assessed case by case. Immunotherapy is not started during pregnancy although maintenance can usually continue. Children under five are generally deferred.

Standard injection immunotherapy does not treat food allergy. Oral immunotherapy for specific foods is a separate specialized treatment delivered in different settings.

The schedule in practice

Build up runs 3 to 6 months with one or two injections a week each slightly stronger than the last. Maintenance follows with an injection every 2 to 4 weeks for 3 to 5 years. You wait 30 minutes in the office after every single injection because that is the window in which almost all systemic reactions occur.

Cluster and rush protocols compress build up into weeks by giving several injections in one visit. Reaction risk is higher and premedication is usually used.

Consistency matters more than people expect. Missed appointments during build up usually require stepping the dose back down which extends the timeline. Planning around travel and work schedules before starting is worth the hour it takes.

Two rules reduce reaction risk and both get ignored. Do not exercise vigorously for two hours before or after an injection because increased circulation speeds absorption. Report any new asthma symptoms before the injection rather than after it.

What results to expect and when

Improvement is gradual rather than sudden. Months 1 to 3 usually bring little noticeable change which is when most people get discouraged. Months 4 to 8 bring reduced symptom intensity and less rescue medication. Months 9 to 18 bring clear improvement in most responders. Years 2 to 5 consolidate it.

After completion benefit commonly persists for years. Some people experience gradual return and a smaller number pursue a second course.

Response is not universal. If 18 months of consistent maintenance produces no change the plan should be reassessed rather than continued on principle.

One benefit gets overlooked. In children immunotherapy for allergic rhinitis is associated with reduced development of new sensitizations and reduced progression to asthma. That preventive effect is a strong argument for treating early rather than waiting to see whether it settles on its own.

Safety and what a reaction looks like

Local reactions are common and expected. Redness swelling and itching at the injection site within a few hours are managed with ice antihistamines and sometimes a dose adjustment. Systemic reactions are uncommon and anaphylaxis is rare under proper protocols but possible which is why injections happen in a medical office.

Systemic reaction signs include sneezing hives widespread itching wheezing throat tightness or a drop in blood pressure. The 30 minute observation period exists for exactly this.

Offices administering immunotherapy keep epinephrine immediately available with staff trained to use it. Many practices also prescribe an epinephrine auto injector such as an EpiPen for patients to carry during the course.

Tell the nurse about new medications at every visit particularly beta blockers and ACE inhibitors and report missed doses accurately so the dose can be stepped correctly rather than guessed.

Sublingual tablets as an alternative

Sublingual immunotherapy tablets dissolve under the tongue and are taken daily at home after the first supervised dose. Products exist in the United States for grass pollen ragweed and dust mite among others. Grastek Ragwitek and Odactra are three brand names in this category.

The advantages are real. No injections. No weekly office visits. The first dose is supervised and the rest happen at home.

The limitation is coverage. Each tablet addresses a single allergen family while an injection formula can combine many. For someone allergic to one thing sublingual therapy is an excellent option. For someone allergic to trees grasses ragweed dust mite and cat the injection route is usually the practical choice.

Daily adherence across several years is also harder than turning up for a scheduled appointment which is worth being honest with yourself about before choosing.

A typical case we see

A woman in her thirties from Logan Square had taken a daily antihistamine for eleven years. She added a nasal steroid four years ago. She still lost most of September to congestion and had started using a rescue inhaler two or three times a week each autumn.

Testing showed strong reactivity to ragweed and dust mite with mild grass sensitivity. The ragweed result matched her symptom calendar exactly which is what made it actionable rather than incidental.

She started build up in November and reached maintenance in March. Her first ragweed season on maintenance was noticeably lighter and her rescue inhaler use fell. She is currently in year three of a planned five.

*Illustrative example. Composite of common presentations. Not a specific individual and not a testimonial.  replace with a real anonymized case from clinic records.*

### Talk to someone about allergy testing and immunotherapy

Walk ins are welcome at 2004 N Pulaski Rd in Chicago. No appointment needed.

Call 773 772 8876 or book an appointment online

See our Allergy and immunotherapy services page for what the visit covers

*Hablamos español. Llame al 773 772 8876 para programar su cita.*

Why Chicago is a hard place to have untreated allergies

Chicago stacks three long outdoor seasons on top of a heavy indoor allergen burden. Tree pollen runs late March through May. Grass runs May through July. Ragweed begins in mid August and continues until the first hard frost which often does not arrive until late October. That leaves a narrow window of genuine relief.

Indoor exposure fills the rest of the year. Older housing stock across Hermosa Humboldt Park and Austin carries dust mite and cockroach allergen at levels that keep symptoms running through winter when windows stay shut and heating systems circulate dust. Our notes on spring allergies in Chicago cover the outdoor half of the calendar.

Two practical consequences. Starting immunotherapy in late autumn or winter positions the build up phase to finish before the spring tree season rather than during it. And an allergy plan built only around pollen misses the half of the year that is driven by what is inside the building.

What happens at your appointment

Two appointment types matter here. The testing visit and the injection visit. They look completely different.

Testing visit. About 90 minutes.

Check in with photo identification insurance card and your medication list. Stop antihistamines several days beforehand if skin testing is planned and confirm with the clinic which medications to hold. A history is taken covering symptom timing location effects and what you have already tried. Skin prick testing is applied to the forearm or back and reads in 15 to 20 minutes. Results are reviewed with you the same day and matched against your symptom pattern. If immunotherapy is appropriate the extract formula is ordered.

First injection visit. About 45 minutes.

The formula is checked against your name and record. The injection goes into the fat layer of the upper arm with a fine needle. You wait 30 minutes in the office. Staff check the site and ask about symptoms before you leave.

Routine injection visits. About 40 minutes.

Report any new medication new asthma symptoms or missed appointments. Injection. 30 minute wait. Site check. Out. Most patients build this into a fixed weekly slot.

Bring something to do during the wait. Over 3 to 5 years that half hour adds up and people who plan for it stay in the programme.

What Medicaid and Medicare cover for allergy testing and immunotherapy in Chicago

Coverage depends on whether a service is medically necessary or cosmetic and it varies by plan. The summary below reflects how Illinois Medicaid and Medicare generally treat these services. Confirm your own plan before the visit because benefits differ between managed care plans.

Generally covered

- Allergy testing when medically necessary and documented

- Allergen immunotherapy extract preparation and injection administration

- Office visits associated with the immunotherapy programme

- Nasal corticosteroids and antihistamines on the plan formulary

- Epinephrine auto injector prescription where clinically indicated

Generally not covered

- Over the counter antihistamines purchased without a prescription in some plans

- Air purifiers dehumidifiers mattress covers and other home equipment

- Testing panels ordered without documented clinical indication

Worth bundling into the same visit

- Annual physical or wellness visit in the same trip

- Asthma assessment and spirometry when respiratory symptoms are present

- Blood work ordered at the same draw

- Prescription pickup at the on site pharmacy

We accept Medicaid and Medicare. Call 773 772 8876 to confirm your plan before the visit. Coverage varies by plan so call to confirm rather than assuming.

Frequently asked questions

Do allergy shots actually work?

Yes for patients whose testing matches their symptom pattern. The majority experience meaningful symptom reduction and benefit commonly persists for years after the course ends which no daily medication achieves.

How long do allergy shots take to work?

Most people notice improvement between month 6 and month 12. Full benefit develops over 2 to 3 years of maintenance.

How long is the allergy shot schedule?

Build up runs 3 to 6 months with one or two injections weekly. Maintenance runs 3 to 5 years with an injection every 2 to 4 weeks.

Can I get allergy shots if I have asthma?

Yes if the asthma is well controlled. Poorly controlled asthma must be stabilized first because systemic reaction risk is higher.

Do allergy shots treat food allergy?

No. Standard subcutaneous immunotherapy does not treat food allergy. Oral immunotherapy for specific foods is a separate specialized treatment.

When is allergy season in Chicago?

Tree pollen runs late March through May. Grass runs May through July. Ragweed runs mid August until the first hard frost which is often late October. Dust mite and cockroach allergen persist year round.

Does Medicaid cover allergy shots in Illinois?

Allergy testing and immunotherapy are generally covered when medically necessary and documented. Billing has two parts covering extract preparation and injection administration. Call 773 772 8876 to confirm your plan before starting.

Why do I have to wait 30 minutes after each injection?

Almost all systemic reactions occur within that window. Waiting in a medical office where epinephrine and trained staff are immediately available is the safety mechanism that makes home dosing unnecessary.

About the reviewer

Otto R. Garcia MD | Internist | Hermosa Medical and Diagnostic Center

Dr Garcia is a board certified internal medicine specialist at Hermosa Medical Center. He cares for adults across the full range of chronic and acute conditions with a focus on long term disease management. He sees patients in English and Spanish.

Next step

If you have taken a daily antihistamine for more than two seasons and still lose weeks each year testing is the logical next move. It tells you whether immunotherapy would even apply to your case.

**Go to Allergy and immunotherapy services** to see what we offer and how to book.

Visit Hermosa Medical and Diagnostic Center

Hermosa Medical and Diagnostic Center has served the Chicago West Side for 33 years. Primary care specialty care laboratory services imaging and an on site pharmacy sit in one building so most visits finish in one trip.

Address 2004 N Pulaski Rd Chicago IL 60639

Phone 773 772 8876

Hours Call 773 772 8876 to confirm current hours

Walk ins Welcome. No appointment needed.

Insurance Medicaid Medicare and most major plans accepted

Languages English Spanish and Arabic

We serve Hermosa Belmont Cragin Humboldt Park Logan Square and Austin.

Hablamos español. Llame al 773 772 8876 para programar su cita. Se habla español.

Book an appointment online

Getting here

We are at 2004 N Pulaski Rd in the Hermosa neighborhood just north of Armitage Ave. Street parking is available on Pulaski Rd and on the surrounding side streets. The CTA 53 Pulaski bus stops directly outside and the 73 Armitage bus runs east from the corner toward the Blue Line.

Embedded Google Map of 2004 N Pulaski Rd Chicago IL 60639. Open in Google Maps (the map embed code is in the markdown version of this file).

Sources

- American Academy of Allergy Asthma and Immunology

- National Institute of Allergy and Infectious Diseases | Allergic Diseases

- US Food and Drug Administration | Allergenic Extracts