Oral Immunotherapy (OIT) for Food Allergies: How It Works and Who It's For

1 day ago

5 min read

Oral immunotherapy (OIT) is a medically supervised treatment that gradually raises the amount of a food allergen your body can tolerate. Patients eat tiny, carefully measured doses of the food they're allergic to, increasing slowly under an allergist's supervision. The goal is protection against accidental exposures, not a cure. OIT is available for children and adults at Five Towns Allergy in Hewlett, NY, under the care of board-certified allergist Dr. Marc Braunstein.

What it is: Daily, measured doses of a food allergen, increased in the office over months.
What it does: Builds a buffer so a hidden bite is far less likely to cause a serious reaction.
Who it's for: People with a confirmed IgE-mediated food allergy, evaluated by an allergist.
Where to start: A consultation at Five Towns Allergy. Call 516-569-5700.

What is oral immunotherapy and how does it work?

In a food allergy, the immune system treats a harmless protein, like peanut or milk, as a threat. Even a trace amount can trigger hives, swelling, vomiting, wheezing, or anaphylaxis.

OIT works by introducing that protein in amounts too small to cause a reaction. The dose is then raised step by step over many months. With regular, consistent exposure, the immune system becomes less reactive. This process is called desensitization.

For families across the Five Towns and Nassau County, that shift matters. Instead of living in fear of a birthday party, a restaurant meal, or a school snack, patients gain a margin of safety.

Who is a good candidate for OIT?

The right candidate has a confirmed IgE-mediated food allergy and a family ready for a long-term daily routine. An allergist makes that call after a full evaluation. You may be a good fit if:

Testing and history confirm a true food allergy, not just a sensitivity.
Accidental exposures cause real fear or have already caused reactions.
The patient can take a daily dose consistently, every day.
The family can keep regular in-office visits during the build-up phase.

OIT may not be the right choice for everyone. Uncontrolled asthma and certain gastrointestinal conditions can make OIT riskier. A history of severe reactions also needs careful review. Dr. Braunstein reviews each patient's history before recommending a treatment plan.

Not sure the allergy is still active? Some children outgrow food allergies. An oral food challenge, done safely in the office, can show whether the allergy is still there. Dr. Braunstein has published research on predictors of oral food challenge outcomes.

What does the OIT process look like?

OIT runs in three phases: an initial dosing day, a months-long build-up, and ongoing maintenance. Every plan is personalized, but most follow this path:

Consultation and testing. Dr. Braunstein reviews your history and confirms the allergy with skin prick testing and, when needed, blood work or an oral food challenge.
Initial dose escalation. In the office, the patient takes very small doses of the allergen, increased gradually, with monitoring the whole time.
Build-up (up-dosing). The patient takes the same dose at home every day. Every few weeks, the dose goes up during an office visit. This phase usually lasts several months.
Maintenance. Once the target dose is reached, the patient keeps taking it daily to hold the protection in place. Follow-up visits continue.

Throughout treatment, patients keep avoiding the food in their regular diet unless their allergist says otherwise. They also keep epinephrine on hand at all times.

Scheduling note: Five Towns Allergy offers Sunday and evening hours, which makes recurring up-dosing visits easier for working parents and school-age kids.

How does OIT compare to other food allergy treatments?

OIT is one of several options, and the right one depends on the patient, the allergen, and the family's goals.

Approach	How it works	Who it's for	Key facts
Strict avoidance	Avoid the food entirely and carry epinephrine	Everyone with a food allergy, as a baseline	No treatment risk, but no added protection against accidental exposure
Oral immunotherapy (OIT)	Daily food-protein doses, increased over months	Confirmed food allergy, family ready for daily routine	Can use measured food doses; requires ongoing daily maintenance

Xolair (omalizumab)	Injection that blocks IgE, the antibody behind allergic reactions	Ages 1 and older with IgE-mediated food allergy, including multiple foods	FDA-approved for food allergy on February 16, 2024; patients still avoid their allergens (source)
Sublingual immunotherapy (SLIT)	Small allergen doses held under the tongue	Patients wanting a lower-dose approach	Lower doses than OIT; see our post on sublingual food immunotherapy

These options can also work together. Some allergists use Xolair alongside OIT. Dr. Braunstein will walk you through which approach, or combination, fits your situation.

Internal links: link "sublingual food immunotherapy" to /post/exploring-sublingual-food-immunotherapy-a-safer-effective-approach-to-managing-food-allergies and "Xolair" to /post/xolair-for-food-anaphylaxis-prevention.

What are the risks, and what results are realistic?

OIT carries real risk, because the treatment involves eating the allergen. That is why it should only be done under an allergist's supervision. Never attempt it at home on your own.

Common side effects are usually mild and include:

Itchy mouth or throat
Stomach pain, nausea, or vomiting
Hives or rash
Sneezing, congestion, or cough

More serious reactions, including anaphylaxis, can happen. Dosing in the office, careful dose increases, and clear home instructions help reduce that risk. Illness, intense exercise, or skipped doses can raise reaction risk. Your care team will explain what to watch for.

Realistic goal: For most patients, success means a hidden bite of their allergen no longer triggers a dangerous reaction. That is life-changing protection, but it is not permission to eat the food freely.

Frequently asked questions about OIT

Is oral immunotherapy a cure for food allergies? No. OIT raises the amount of an allergen your body can tolerate. Most patients need a daily maintenance dose to keep that protection.

What age can a child start OIT? As soon as a food allergy is diagnosed, even in infancy.

Which foods can be treated with OIT? OIT is used most often for common allergens such as peanut, tree nuts, milk, and egg. Ask Dr. Braunstein which foods can be included in your plan.

How long does OIT take? The build-up phase usually takes several months of regular office visits. Maintenance dosing then continues long term.

Can adults do OIT? Yes, adults with a confirmed food allergy may be candidates. Dr. Braunstein is board-certified in both pediatric and adult allergy and immunology.

Does insurance cover OIT? Only challenge appointments. However, updosing appointments and oral immunotherapy allergen serums are not covered.

Where can I get OIT near the Five Towns? Five Towns Allergy offers OIT at 1705 Broadway, Suite 3, in Hewlett, NY. In addition to the Five Towns, the office serves the surrounding areas of Lynbrook, Valley Stream, Oceanside, the rest of Nassau County and even parts of Queens and Brooklyn.

Schedule an OIT consultation with Dr. Braunstein

If food allergies are shaping your family's life, a consultation is the first step toward a plan. Dr. Marc Braunstein is board-certified in pediatric and adult allergy and immunology. He holds hospital appointments at Northwell Health and Mercy Hospital, and his published research focuses on childhood food allergy.

At Five Towns Allergy, you'll find: