Oral immunotherapy (desensitisation) for food allergy (Oral immunotherapy (OIT) for food allergy)
A specialist treatment that gives gradually increasing amounts of a food allergen to reduce the severity of reactions to accidental exposure; it desensitises rather than cures.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- OIT desensitises rather than cures: it raises the amount of a food you can tolerate, reducing the danger of accidental exposure, but it does not make the allergy go away.
- Protection usually only lasts while you keep taking the daily dose, which most people must continue indefinitely.
- Reactions are common during treatment, especially while the dose is increasing, and can include anaphylaxis, so dose increases are supervised and it is never done at home unsupervised.
- You must still avoid the food in everyday life, carry adrenaline auto-injectors and follow an emergency plan; OIT is offered only through specialist centres.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Can raise the amount of a food you tolerate before reacting
Severe or poorly controlled asthma, which greatly increases the danger of reactions.
You are watched closely for several hours after the first doses, as this is when reactions are most likely.
Clear written dosing and safety-routine instructions, plus an emergency action plan.
You are watched closely for several hours after the first doses, as this is when reactions are most likely.
A higher dose is given and observed in clinic; you then continue that dose daily at home.
You take the dose following the safety routine (for example avoiding exercise and hot baths around dosing) and...
You contact the team; dosing may be paused or reduced, as restarting at full dose can be dangerous.
What is oral immunotherapy for food allergy?
Oral immunotherapy (OIT) is a specialist treatment for food allergy. You are given a very small amount of the food allergen, which is then slowly increased over months until a maintenance dose is reached and taken every day.
The aim is desensitisation: raising the amount of the food you can tolerate before reacting, so that an accidental exposure is less likely to cause a severe reaction. It is not a cure. Most people must keep taking the daily dose indefinitely, because protection usually fades if dosing stops.
OIT does not make a food allergy go away or mean you can eat the food freely. You still need to avoid the food in normal life, carry adrenaline auto-injectors and follow an emergency plan.
Reactions during treatment are common, especially while the dose is being increased, and can include anaphylaxis. Because of this, dose increases are always supervised, and OIT is only offered through experienced specialist centres. It is not a do-it-yourself treatment.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
OIT vs strict avoidance
| Oral immunotherapy | Strict avoidance | |
|---|---|---|
| Main aim | Reduce severity of accidental exposure | Prevent exposure altogether |
| Reactions during treatment | Common, especially in build-up | Only from accidental exposure |
| Ongoing effort | Daily dosing, regular clinic visits | Vigilance and label-reading |
| Still need auto-injectors? | Yes | Yes |
OIT is an addition to, not a replacement for, avoidance and an emergency plan. It suits some people and not others.
Preparing for your treatment
- Have a confirmed food allergy diagnosis and a full discussion of why OIT is being considered for you.
- Understand that this is a long commitment of daily dosing and regular supervised visits, possibly for years.
- Make sure asthma and eczema are well controlled, as poor control increases reaction risk during treatment.
- Bring a list of medicines and tell the team about beta-blockers, ACE inhibitors and any other allergies.
- Plan for dosing routines at home, including avoiding hot baths, vigorous exercise and dosing on an empty stomach if advised, as these can trigger reactions.
- Make sure you have in-date adrenaline auto-injectors and know how and when to use them before starting.
What happens
Treatment starts with initial dose escalation in clinic, where a tiny amount of the food is given and you are watched closely, because this is when reactions are most likely.
You then take a daily dose at home and return regularly so the dose can be increased under supervision. Each increase is given in clinic and observed for a period. Between visits you keep taking the same dose daily.
Throughout, the team advises on things that make reactions more likely, such as exercise soon after a dose, illness, hot baths or an empty stomach, and on how to adjust dosing if you are unwell.
Once the target maintenance dose is reached, you continue it every day. If dosing is interrupted, the dose may need to be reduced and rebuilt under supervision, as restarting at the full dose can be dangerous. You keep carrying adrenaline auto-injectors and following your emergency plan throughout.
Is this treatment right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Severe or poorly controlled asthma, which greatly increases the danger of reactions.
- Eosinophilic oesophagitis or significant ongoing gut symptoms.
- Inability to commit to daily dosing, safety routines and regular supervised visits.
- A preference for strict avoidance, which remains a valid and safe choice for many.
Delay or rearrange if…
- Asthma or eczema is currently flaring or poorly controlled.
- There is an active infection or illness.
- Adrenaline auto-injectors are not in date or you are not confident using them.
- Major life events make consistent daily dosing and clinic attendance impractical for now.
Alternatives to discuss
- Strict allergen avoidance with an emergency plan and adrenaline auto-injectors.
- Education on label-reading, eating out and accidental-exposure planning.
- Reassessment over time, as some childhood allergies are outgrown.
- Discussion of research studies where appropriate, with full informed consent.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Can raise the amount of a food you tolerate before reacting
- May reduce the severity of a reaction to accidental exposure
- Can lessen anxiety about accidental exposure for some families
- Offers an active option for selected people who want more than avoidance alone
- Is closely supervised, so reactions during dose increases are treated quickly
Risks & complications
- Mouth itching, tummy ache, nausea or vomiting around dosing
- Mild allergic symptoms during the build-up phase
- Reactions triggered by exercise, illness or hot baths after a dose
- The burden of daily dosing and frequent supervised visits
- Reactions needing antihistamines, steroids or adrenaline
- Having to slow down, pause or stop treatment because of repeated reactions
- Ongoing tummy symptoms that affect quality of life
- Anaphylaxis, including during maintenance and from a previously tolerated dose
- Eosinophilic oesophagitis (inflammation of the gullet) that may require stopping treatment
OIT deliberately exposes you to a food you are allergic to, so reactions are an expected part of treatment, not a sign it has gone wrong, and they can be severe. Risk is higher during dose increases and when other triggers are present, such as exercise, illness or hot baths after a dose. This is why every dose increase is supervised and why you must keep carrying adrenaline. Discuss honestly whether the daily commitment and reaction risk are right for you, and what would lead the team to stop.
Published figures to discuss
Because OIT deliberately gives the allergen, reactions are expected, particularly during build-up, and a minority are severe. Reported rates vary widely between studies, foods, ages and protocols, and depend on co-factors such as exercise and illness, so a single number does not capture individual risk. The figures below come from pooled peanut OIT trial data and should be read as showing direction and scale, not a personal prediction.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Anaphylaxis during treatment vs avoidance | Roughly 3 times more likely on OIT than on avoidance in pooled peanut trial data | Most reactions are not severe, but the increase is real, which is why dosing is supervised and adrenaline carried. | Guide sourcesClinical context |
| Any treatment-related reaction during peanut OIT | Most participants experience reactions, most often mild or moderate | Reactions are commonest during up-dosing and tend to lessen over time, but do not disappear. | Guide sourcesClinical context |
| Eosinophilic oesophagitis during food OIT | Uncommon; often quoted around low single-digit percentages | Persistent swallowing difficulty, food sticking, chest pain or vomiting during OIT should be reported. | Weighing the benefits and risks of oral immunotherapy in clinical practice (PMC)pmc.ncbi.nlm.nih.govSource-linked context |
| Loss of protection if regular dosing stops | Common concern; OIT is desensitisation, not a guaranteed cure | Daily dosing, dose holds during illness and rules around exercise or hot showers are part of the treatment burden. | Guide sourcesClinical context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
This is an ongoing treatment rather than a one-off, so 'afterwards' means living with daily dosing and the routines that keep it safe. After each supervised dose increase you are observed for a period because reactions can develop after the dose.
- Mild mouth tingling or tummy upset around the daily dose
- Occasional mild symptoms that settle, especially early on
- Needing to plan daily life around the dosing routine
- Continued need to avoid the food and carry auto-injectors
Aftercare
- Take the daily dose exactly as instructed and do not change it yourself.
- Follow the safety routine: avoid vigorous exercise, hot baths and an empty stomach around dosing if advised.
- Contact the team before continuing if you are unwell, have worse asthma, or have missed doses.
- Keep carrying in-date adrenaline auto-injectors and follow your emergency plan.
- Keep avoiding the food in normal life; OIT does not make it safe to eat freely.
- Attend all reviews so side effects and progress can be checked.
- A confirmed diagnosis and a clear discussion of why OIT suits you
- Well-controlled asthma and eczema before starting
- In-date adrenaline auto-injectors and confident technique
- A plan for daily dosing and the safety routine at home
- The specialist centre's contact and out-of-hours number
- Agreement on what would lead to pausing or stopping treatment
⚠ Get urgent help if…
- Difficulty breathing, wheeze, persistent cough or a tight throat
- Swelling of the lips, tongue, throat or face
- Widespread hives or sudden severe itching
- Feeling faint, floppy, dizzy or collapsing
- Repeated vomiting or severe tummy pain after a dose
- Difficulty or pain on swallowing, food sticking, or ongoing reflux (possible gullet inflammation)
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A good response means you can tolerate more of the food before reacting, which can make an accidental exposure less dangerous. This protection only holds while you keep taking the daily dose. A minority of people may later tolerate the food after a break, but this cannot be promised and should not be assumed.
OIT does not cure the allergy or mean the food is safe to eat normally. You still avoid the food, carry adrenaline and follow an emergency plan. Whether the benefit is worth the daily dosing and reaction risk is a personal decision to weigh carefully with your specialist.
Desensitisation from OIT is generally dependent on continued daily dosing: if dosing stops, the protection usually fades and reactions can return, sometimes at lower doses than before. This is why most people are advised to continue indefinitely. Some achieve longer-lasting tolerance, but this is not reliable. Any plan to reduce or stop dosing should only be made with the specialist team.
Related tests, treatments or support
OIT is used alongside, not instead of, allergen avoidance and an emergency plan, and good control of asthma and eczema is important throughout. It is considered only after a clear food allergy diagnosis. Research is exploring combining OIT with other treatments, but these are not routine. In the UK, the previously approved peanut OIT product (Palforzia) is no longer being started in new patients, so availability is mainly through specialist or research settings.
Follow-up & long-term care
You are reviewed regularly during build-up and maintenance to check tolerance, side effects (including gullet symptoms), auto-injector technique and whether to continue. The specialist centre provides clear advice on dosing when you are unwell or have missed doses, and your GP is kept informed for prescriptions and emergency medicines.
- Take the daily maintenance dose every day, indefinitely, unless the team advises otherwise.
- Never restart at the full dose after a gap; contact the team first.
- Keep adrenaline auto-injectors in date and carry them at all times.
- Keep asthma and eczema well controlled.
- Attend reviews and report any swallowing or reflux symptoms promptly.
- Continue avoiding the food in everyday life.
Repeat, follow-on and what comes next
- Doses are often adjusted, paused or reduced because of reactions or illness.
- Treatment is sometimes stopped if reactions are frequent or severe, or gullet symptoms develop.
- After any gap, the dose may need rebuilding under supervision rather than restarting at full strength.
- Protection can be lost if dosing stops, so plans are reviewed regularly.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- Clear written dosing and safety-routine instructions, plus an emergency action plan.
- Explicit advice on what to do when unwell or after missed doses, before continuing.
- Regular reviews including checks for gullet symptoms and auto-injector technique.
- A named specialist-centre contact and an agreed plan for pausing or stopping treatment.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- The long duration of supervised build-up and ongoing maintenance
- Frequent clinic visits for supervised dose increases
- The allergen product or food preparation used
- Staff time and facilities to monitor and treat reactions safely
- Adrenaline auto-injectors and emergency medicines
- Ongoing reviews over months to years
- The specialist centre's assessment and supervision fees
- How many supervised up-dosing visits are expected and their cost
- The cost of the allergen product or preparation over time
- Facility fees for supervised dosing and monitoring
- Ongoing maintenance reviews and how long they continue
- What happens, and what it costs, if reactions force pauses, dose reductions or stopping
- The cancellation policy
On the NHS? Oral immunotherapy is not a routine NHS treatment; it is available mainly through specialist centres or research, and the previously approved peanut product is no longer being started in new UK patients.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Describing OIT as a cure or as making the food safe to eat freely.
- Not making clear that daily dosing usually has to continue indefinitely.
- Underplaying how common reactions are during build-up, or the anaphylaxis risk.
- Starting before asthma is controlled or before auto-injector training is in place.
Marketing red flags
- Offering OIT outside an experienced specialist centre, or as a home programme without supervision.
- Claiming OIT cures food allergy or lets you eat the food normally.
- Guaranteeing success or downplaying reaction risk.
- Suggesting you can stop carrying adrenaline once desensitised.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Why might OIT suit me, and what are the realistic benefits in my case?
- How likely are reactions during treatment, and how severe could they be?
- Do I have to keep taking the dose forever, and what happens if I stop?
- What daily routines and precautions reduce the risk of a reaction?
- What would make you pause or stop my treatment?
- How is this supervised, and who do I contact if I react at home?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my treatment, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this treatment not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Will oral immunotherapy cure my (or my child's) food allergy?
Can I eat the food normally after treatment?
Are reactions during treatment normal?
Can I do this at home on my own?
What happens if I stop the daily dose?
Is OIT available on the NHS?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: Oral immunotherapy for peanut allergy (PACE) — systematic review and meta-analysis (PubMed) Weighing the benefits and risks of oral immunotherapy in clinical practice (PMC) Anaphylaxis UK — oral immunotherapy for peanut-allergic adults NICE TA769 — Palforzia for peanut allergy (guidance and withdrawal status) Allergy UK — allergy testing and management
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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