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What Is ILIT? A Shorter, Targeted Approach to Environmental Allergy Treatment

What if allergy treatment didn’t have to take years?

If you live with environmental allergies in North Texas, you probably already understand how much time allergies can take from your life.

Time spent checking pollen counts.

Time spent avoiding the outdoors.

Time spent dealing with congestion, sneezing, itchy eyes and drainage.

Time spent trying one medication after another.

And for patients who choose traditional allergy shots, there can also be a significant time commitment involved in immunotherapy.

But what if there were another approach for select allergy patients?

Intralymphatic Immunotherapy, or ILIT, is a targeted form of allergen immunotherapy that delivers a small amount of allergen directly into a lymph node under ultrasound guidance.

At AIR Care, MD in Dallas and Plano, our ILIT protocol consists of just three injections, spaced approximately four weeks apart. 

For the right patient, that can mean a dramatically shorter treatment schedule than conventional subcutaneous allergy immunotherapy.

Less time treating your allergies. More time living your life.

What Is Intralymphatic Immunotherapy (ILIT)?

ILIT stands for Intralymphatic Immunotherapy.

Like traditional allergy immunotherapy, the goal is to help change how the immune system responds to specific allergens rather than only treating symptoms when they occur.

The difference is where the allergen is administered.

Traditional subcutaneous immunotherapy—what most people call “allergy shots”—places allergen extract under the skin. Treatment generally involves an initial buildup period followed by maintenance injections that may continue for several years.

With ILIT, a very small amount of allergen extract is administered directly into a lymph node.

At AIR Care, MD, ultrasound is used to locate a lymph node in the inguinal, or groin, area and guide the injection accurately. The procedure itself generally takes only a few minutes, followed by at least one hour of observation after each injection. 

Why Inject an Allergen Into a Lymph Node?

This is usually the first question patients have—and understandably so.

Lymph nodes play an important role in the immune system. They are sites where immune cells encounter antigens and coordinate immune responses.

ILIT takes advantage of that biology by delivering the allergen directly to a lymph node rather than relying on an injection under the skin.

Researchers have been studying whether this more targeted delivery can produce allergen tolerance using far fewer injections than conventional allergy shots.

Clinical studies of ILIT have commonly used three injections approximately four weeks apart, although protocols have varied among studies. 

How Many ILIT Treatments Does AIR Care, MD Use?

AIR Care, MD’s current ILIT protocol consists of:

3 injections total

with each treatment spaced approximately

4 weeks apart.

That means the treatment series itself occurs over roughly two months from the first injection to the third.

Patients also take required pretreatment medications beginning two days before each ILIT injection. Your AIR Care provider will review those medications, your medical history and any contraindications during your immunotherapy consultation. 

This shorter schedule is one of the primary reasons some patients are interested in ILIT.

ILIT vs. Traditional Allergy Shots

Traditional subcutaneous immunotherapy, or SCIT, has an extensive history in allergy treatment and remains an important option for many patients.

But it requires commitment.

Conventional allergy shots typically involve frequent injections during a buildup phase followed by maintenance treatment that can continue for three to five years. 

For some patients, that’s completely manageable.

For others, repeated trips to an allergy office become one of the biggest obstacles to starting—or completing—immunotherapy.

Work schedules, school, childcare, transportation, travel and other responsibilities can make a multi-year treatment schedule difficult.

ILIT is being investigated and used as a much shorter-course approach.

Instead of thinking about one as universally “better” than the other, a more useful question is:

Which form of allergy treatment is appropriate for this particular patient?

That’s a conversation to have with your allergy specialist.

What Allergies Can AIR Care, MD Treat With ILIT?

At AIR Care, MD, ILIT is designed for select patients with confirmed environmental allergies.

Depending on the patient’s allergy testing and clinical history, relevant environmental allergens may include:

That distinction matters.

ILIT is not simply a treatment you request because you experience allergy symptoms.

Your allergist first needs to understand what you’re allergic to and whether those sensitivities correspond with your actual symptoms and exposures.

Who Might Be a Candidate for ILIT?

ILIT isn’t appropriate for every allergy patient.

AIR Care, MD notes that potential candidates may include people who have confirmed environmental allergies, want a shorter treatment course, have difficulty committing to long-term allergy shots, or have not achieved adequate symptom control with medications alone. 

Your provider will consider your allergy testing, symptoms, medical history and treatment goals before determining whether ILIT may be appropriate.

That individualized evaluation is important because allergy treatment should never be one-size-fits-all.

What Happens Before ILIT?

The first step is not the injection.

The first step is understanding your allergies.

If you’re a new patient, your AIR Care provider can review your history and symptoms and determine what testing or evaluation is appropriate.

Questions may include:

When are your symptoms worst?

Are they seasonal or year-round?

Are you affected primarily indoors or outdoors?

Do symptoms change around animals?

Which medications have you tried?

How well do those medications work?

How much are allergies interfering with sleep, exercise, work or everyday activities?

Your allergy testing and clinical history help your provider determine which allergens are actually relevant to you and whether immunotherapy should be considered.

What Happens During an ILIT Appointment?

AIR Care’s ILIT procedure uses ultrasound guidance.

The ultrasound allows the provider to identify the lymph node and accurately guide the injection. Accurate intranodal placement is an important technical component of ILIT, and research has emphasized the importance of ultrasound technique and proper needle positioning. 

The actual procedure generally takes only a few minutes.

Afterward, AIR Care requires patients to remain in the office for at least one hour so the clinical team can monitor for a reaction. 

Patients should plan accordingly rather than thinking of the visit as simply a few-minute injection appointment.

Is ILIT Painful?

Any injection can cause some discomfort.

AIR Care reports that most patients tolerate ILIT well, although mild local discomfort or swelling can occur. 

Published research has likewise generally found that adverse events associated with ILIT are predominantly local and mild, although allergic reactions—including serious reactions—remain possible with allergen immunotherapy. 

That’s one reason ILIT should be performed in an appropriate medical setting by clinicians trained in allergy care, with observation afterward.

Does ILIT Really Work?

This deserves a more nuanced answer than a marketing slogan.

Research on ILIT is promising, but the evidence is still developing.

A 2021 systematic review and meta-analysis involving 17 clinical trials found improvements in allergy symptom and medication scores and measures of allergen desensitization. The authors concluded that larger randomized, double-blind, placebo-controlled trials were still needed before broader adoption. 

A 2023 meta-analysis of 13 studies involving 454 participants also reported improvement in combined symptom/medication scores and allergy-related quality of life compared with placebo. 

However, not every analysis has reached the same conclusion. A 2021 systematic review found no significant difference between ILIT and placebo across several primary outcomes and emphasized substantial variation among the available studies. 

More recently, a 2025 overview of seven systematic reviews and meta-analyses concluded that ILIT appears to improve allergic rhinitis symptoms and measures of tolerance, particularly for grass pollen and mixed allergens, while noting that much of the underlying evidence remains low quality and long-term effectiveness is less certain. 

In other words:

ILIT is an exciting and promising approach—but it shouldn’t be presented as a guaranteed three-shot cure for allergies.

Individual results can vary, and patients should discuss the potential benefits, limitations and alternatives with an allergy specialist.

Why the Shorter Treatment Schedule Matters

The biggest story behind ILIT isn’t simply the number three.

It’s what those three appointments could mean for the right patient.

Think about someone who has considered traditional allergy shots but keeps putting them off because of work.

Or the parent trying to coordinate school pickup, sports and multiple children’s schedules.

Or the patient who travels frequently.

Or someone who lives far enough from the office that frequent appointments are difficult.

For those patients, the time commitment itself can become a barrier to immunotherapy.

A shorter treatment course may make the conversation different.

Instead of:

“Can I realistically commit to years of appointments?”

the question becomes:

“Am I an appropriate candidate for this particular approach?”

That’s an important distinction.

ILIT Doesn’t Mean “Three Shots and Your Allergies Are Gone”

This is worth emphasizing.

Allergen immunotherapy is designed to modify the immune response to relevant allergens.

It isn’t a magic eraser.

Results can vary from patient to patient. The amount and durability of improvement may differ, and researchers continue to study ILIT’s long-term effectiveness. Current reviews suggest that short- and medium-term results are encouraging for certain allergens, while longer-term evidence remains more limited. 

That’s why AIR Care, MD evaluates each patient individually rather than treating ILIT as a universal solution.

What If Allergy Medicine Is Working?

You don’t necessarily need immunotherapy simply because you have allergies.

Some patients manage their symptoms successfully with appropriate medications and environmental strategies.

But it may be worth discussing additional treatment options if you find yourself continually taking medication yet remaining symptomatic, avoiding activities because of allergies, struggling during multiple allergy seasons, or simply wanting to explore an approach that targets the allergic response itself.

AIR Care specifically identifies inadequate symptom control with medication as one factor that may make ILIT worth discussing. 

Why This Can Be Especially Relevant for North Texas Allergy Patients

Dallas-Fort Worth allergy sufferers know that “allergy season” isn’t always much of a season.

North Texas patients may encounter different environmental triggers throughout the year, making persistent or recurring symptoms frustrating.

For someone with confirmed sensitivities to environmental allergens, repeatedly treating symptoms without understanding the triggers can become an endless cycle:

Allergen exposure → symptoms → medication → temporary relief → repeat.

Immunotherapy takes a different approach by attempting to change the immune system’s response to relevant allergens.

For select patients, ILIT offers another way to have that conversation.

Questions to Ask About ILIT

If you’re considering ILIT, come to your consultation prepared to ask questions such as:

The goal should never be simply to choose the treatment requiring the fewest appointments.

The goal is to choose an appropriate treatment for your allergies, your health and your goals.

Less Time Treating Your Allergies. More Time Living Your Life.

For the right patient, the appeal of ILIT is easy to understand.

Environmental allergies already take enough from your calendar.

Your treatment doesn’t necessarily have to take years of it, too.

At AIR Care, MD, our allergy, asthma and immunology team offers ILIT as an option for select patients with confirmed environmental allergies. Our providers can review your testing, symptoms, medical history and treatment goals to determine whether this shorter, targeted approach may be appropriate for you. AIR Care’s current protocol uses three ultrasound-guided injections approximately four weeks apart. 

Less time treating your allergies.
More time living your life.

Could ILIT Be Right for You?

AIR Care, MD is currently accepting new patients in Dallas and Plano.

Call to schedule an allergy or ILIT consultation:

Dallas: 214-373-1773
Plano: 972-473-7544

Learn more about ILIT at AIR Care, MD

Frequently Asked Questions About ILIT

What does ILIT stand for?

ILIT stands for Intralymphatic Immunotherapy. It is a form of allergen immunotherapy in which allergen extract is administered directly into a lymph node under ultrasound guidance.

How many ILIT injections are needed?

AIR Care, MD’s current protocol consists of three injections approximately four weeks apart. Protocols used in research studies can vary. 

How is ILIT different from traditional allergy shots?

Traditional subcutaneous immunotherapy administers allergens beneath the skin and generally involves a buildup period followed by maintenance therapy over several years. ILIT administers allergen directly into a lymph node and can use a much shorter treatment schedule. 

What allergies can ILIT treat?

AIR Care offers ILIT to select patients with confirmed environmental allergies. Whether it is appropriate depends on the individual’s allergy testing, symptoms, medical history and treatment goals. 

Is ILIT a cure for allergies?

ILIT should not be described as a guaranteed cure. Research suggests potential benefits for allergic rhinitis, but results vary, studies have produced some conflicting findings, and additional high-quality research—particularly on long-term effectiveness—is needed. 

Is ILIT safe?

Published reviews generally report a favorable safety profile, with many reported reactions being mild and local. However, systemic allergic reactions can occur with allergen immunotherapy, so ILIT should be administered in an appropriate medical setting with post-treatment observation. 

Do I need allergy testing before ILIT?

AIR Care evaluates allergy testing, symptoms and treatment goals when determining whether ILIT is appropriate. Confirming clinically relevant environmental allergies is an important part of determining candidacy. 

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