Biologic therapy for IBD
Treatment with targeted antibody medicines, given by drip or injection, to control moderate to severe Crohn's disease or ulcerative colitis when other treatments are not enough.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Biologics are targeted antibody medicines, given by drip or injection, for moderate to severe Crohn's or colitis when other treatments are not enough.
- They change how the immune system works, so they raise the risk of infection — including reactivating hidden tuberculosis — which is why screening before starting is essential.
- Benefit builds over weeks to months; they are not a cure, do not work for everyone, and can lose effect over time, sometimes needing a switch.
- Safe use means infection screening, up-to-date vaccinations (no live vaccines while on treatment), and ongoing monitoring with a specialist IBD team.
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 settle inflammation in moderate to severe disease that has not responded to other treatments.
When active tuberculosis, an untreated serious infection or other contraindication is present and must be dealt with first.
Screening for infections (including TB and hepatitis B) and a vaccination review are completed, so treatment can start safely.
Completed infection screening and an up-to-date vaccination plan before starting.
Screening for infections (including TB and hepatitis B) and a vaccination review are completed, so treatment can...
An infusion takes about one to two hours with observation; an injection takes minutes. Most people carry on with...
Improvement builds gradually. The team checks response and side effects with reviews and blood tests, and may...
If the biologic works, it is continued for maintenance with regular monitoring. If it does not work or loses...
What is biologic therapy for IBD?
Biologics are medicines made from antibodies that target specific parts of the immune system driving inflammation in inflammatory bowel disease (IBD). Rather than dampening the whole immune system broadly, they block particular signals — for example tumour necrosis factor (anti-TNF medicines such as infliximab and adalimumab), or molecules that bring inflammatory cells into the gut.
They are used for moderate to severe Crohn's disease or ulcerative colitis, usually when aminosalicylates, steroids and immunomodulators have not controlled the disease, or when disease is severe from the outset. Some are given as a drip (infusion) in a day unit, others as an injection under the skin that you can learn to do at home. Newer targeted tablets work in a related way.
Because they change how the immune system works, biologics can increase the risk of infection, including reactivating hidden (latent) tuberculosis. For this reason, you are screened before starting — for infections such as TB, hepatitis B and others — and monitored during treatment.
Biologics can be very effective and have transformed IBD care, but they are not a cure, do not work for everyone, and can lose effect over time. The aim is lasting remission with careful attention to safety.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Infusion vs injection biologics
| Feature | Infusion (drip) | Injection (under the skin) |
|---|---|---|
| Where | Hospital or day unit | Often at home after training |
| Time | About 1–2 hours plus observation | A few minutes |
| Schedule | Spaced doses, e.g. every few weeks | Regular self-injections |
| Monitoring | Observed during infusion | Self-managed with team support |
Choice depends on the medicine, your preference and your situation; both need the same safety screening and monitoring.
Preparing for your treatment
- Complete infection screening before starting — typically tuberculosis (including latent TB), hepatitis B and C, HIV and chickenpox immunity.
- Get vaccinations up to date beforehand, as live vaccines should not be given once you are on treatment.
- Tell your team about any current or recent infections, and about past TB or TB exposure.
- Share your full medicine list, including other immune-modifying drugs.
- Discuss pregnancy plans or breastfeeding, as this affects choice and timing.
- Ask how the medicine is given, how often, and what monitoring you will need.
- Make sure you have clear instructions on spotting and reporting infection.
What happens
Before starting, you have screening blood tests and checks for hidden infections, particularly tuberculosis and hepatitis B, because biologics can wake these up. Your vaccinations are reviewed and updated, with any live vaccines given before treatment begins.
Infusions are given in a day unit: a cannula is placed and the medicine is dripped in over about one to two hours, with observation for any reaction. Injectable biologics are given under the skin, often starting with a higher 'loading' dose, and many people are taught to inject at home.
After starting, you are monitored for response and side effects, with blood tests and reviews by the IBD team. The first signs of improvement may take a few weeks, with fuller benefit over a few months. Doses or intervals may be adjusted, and sometimes drug levels in the blood are checked to fine-tune treatment.
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…
- When active tuberculosis, an untreated serious infection or other contraindication is present and must be dealt with first.
- When the diagnosis or disease severity does not justify the risks of a biologic.
- Certain biologics in people with specific conditions, such as some heart or neurological problems with anti-TNF medicines.
- When safer or first-line treatments have not yet been properly tried, unless disease is severe.
Delay or rearrange if…
- Infection screening (TB, hepatitis B and others) is incomplete.
- You have a current infection that needs treating first.
- Live vaccinations are still needed and should be given before starting.
- You are pregnant or planning pregnancy and treatment choice needs review.
Alternatives to discuss
- Optimising aminosalicylates, steroids (short-term) and immunomodulators.
- Switching to a different biologic or targeted tablet if one is unsuitable.
- Surgery when appropriate, particularly in localised Crohn's or severe colitis.
- Nutritional therapy in selected cases, especially some young people with Crohn's.
- Clinical trials of newer treatments.
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 settle inflammation in moderate to severe disease that has not responded to other treatments.
- Can bring and keep many people in remission, reducing flares.
- Can reduce the need for repeated steroid courses and their side effects.
- May help heal the bowel lining, which is linked to fewer complications.
- Can reduce the chance of some operations when disease is well controlled.
- Options exist, so if one biologic does not work another may.
Risks & complications
- Higher risk of infections, including chest, throat and other common infections
- Injection-site reactions or, for infusions, reactions during the drip
- Headache, tiredness or feeling generally unwell around treatment
- Treatment that works at first but loses effect over time
- More serious infections needing antibiotics or hospital care
- Reactivation of hidden (latent) tuberculosis or hepatitis B if not screened and managed
- Developing antibodies against the medicine, reducing its effect
- Abnormal blood tests requiring a change of treatment
- Severe allergic or infusion reactions
- A small increased risk of certain cancers with some treatments, especially combined with other immune-suppressing drugs
- Rare neurological or other organ side effects depending on the medicine
The central trade-off with biologics is strong disease control against an increased risk of infection. Reactivation of latent tuberculosis is a particular concern with anti-TNF medicines, which is why TB and hepatitis B screening before starting is essential, and why live vaccines are avoided during treatment. Ask which infections you have been screened for, what symptoms should prompt urgent contact, and how your treatment will be monitored.
Published figures to discuss
The benefit and risk of biologics vary by medicine, by whether they are combined with other immune-suppressing drugs, and by the individual. Infection is the main safety concern, and the risk of reactivating latent tuberculosis is clearly increased with anti-TNF medicines, which is why screening is mandatory. Reported figures come from trials and registries in selected patients, so they guide rather than predict your personal risk.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Reactivation of latent tuberculosis (anti-TNF medicines) | Risk is clearly increased; most cases occur within the first 6 months of treatment | This is why TB screening before starting is essential; rates vary by background TB risk and exact figures should not be over-interpreted. | Biologic agents and tuberculosis risk — PubMedpubmed.ncbi.nlm.nih.govSource-linked context |
| Serious infections | Increased compared with no immune-suppressing treatment, especially when combined with other immunosuppressants | Absolute risk varies by medicine, age and other illnesses; report fever, persistent cough, shingles, severe diarrhoea or feeling systemically unwell promptly. | Biologic agents and tuberculosis risk — PubMedpubmed.ncbi.nlm.nih.govSource-linked context |
| Infusion or injection reactions | Recognised and medicine-specific | Reactions range from mild flushing/itching to rare severe allergy. Infusion units monitor for this; delayed reactions can occur after leaving. | Guide sourcesClinical context |
| Loss of response or antibody formation | Recognised over time | Drug levels, antibody tests, dose optimisation or switching class may be needed if symptoms or inflammatory markers return. | Guide sourcesClinical context |
| Vaccination and live-vaccine restrictions | Clinically important | Vaccine status should be reviewed before treatment. Live vaccines may be unsafe once immunosuppression has started. | 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
Biologic therapy is ongoing treatment rather than a one-off procedure. There is little physical recovery from each dose, but it takes weeks to months to see the benefit, and monitoring for response and infection continues throughout.
- No major physical recovery after each dose for most people
- Mild tiredness, headache or injection-site soreness around treatment
- Improvement over weeks rather than immediately
- Regular monitoring blood tests becoming a normal routine
Aftercare
- Watch for signs of infection (fever, persistent cough, feeling very unwell) and report them promptly.
- Attend all monitoring blood tests and reviews with the IBD team.
- Keep to your dosing schedule; do not skip or delay doses without advice.
- Avoid live vaccines while on treatment, and check before any vaccination or travel jabs.
- Tell any healthcare professional treating you that you are on a biologic.
- Store and inject home medicines exactly as trained, and dispose of needles safely.
- Seek urgent advice for high fever, breathing problems or a severe reaction.
- Infection screening (TB, hepatitis B and C, HIV, chickenpox) completed
- Vaccinations reviewed and updated before starting
- Clear list of infection symptoms to report
- Monitoring blood-test schedule understood
- IBD team and urgent-contact details saved
- Home injection training and sharps disposal arranged if relevant
⚠ Get urgent help if…
- High fever, shivering or feeling very unwell (possible serious infection)
- A persistent cough, night sweats or weight loss (possible tuberculosis)
- Breathing difficulty, swelling, rash or feeling faint during or after a dose (possible reaction)
- Yellowing of the skin or eyes (possible hepatitis)
- Severe tummy pain or heavy rectal bleeding (possible severe flare)
- Any spreading skin infection, abscess or non-healing wound
- These need urgent medical assessment; tell them you are on a biologic
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 result with a biologic is lasting remission — the bowel calm, symptoms controlled and fewer flares — ideally with healing of the bowel lining and less need for steroids. Benefit usually builds over weeks to months rather than immediately.
Biologics are not a cure and do not work for everyone. Some people respond well, others only partly, and some lose response over time and need a different medicine or dose. Drug-level testing sometimes helps explain why a biologic is not working. The goal is durable control with careful safety monitoring, not a guarantee the disease will never return.
When a biologic works and is well tolerated, it is often continued long term to maintain remission, with ongoing monitoring. Some people stay well for years; others lose response and need a switch. Whether and when treatment can ever be reduced or stopped is an individual decision made with your specialist, balancing the risk of flare against long-term treatment.
Related tests, treatments or support
Biologics are sometimes combined with an immunomodulator (such as azathioprine), which can improve response and reduce antibodies against the drug, though this combination raises infection and other risks and is weighed up individually. Biologic therapy sits within wider IBD care, alongside monitoring tests such as faecal calprotectin, endoscopy, vaccinations and surveillance.
Follow-up & long-term care
You should be followed up by a specialist IBD team, with monitoring blood tests, review of response and side effects, and a named contact for problems. Follow-up includes watching for infection, keeping vaccinations current, sometimes checking drug levels, and deciding whether to continue, adjust or switch treatment.
- Regular monitoring blood tests for safety and response
- Keeping vaccinations up to date and avoiding live vaccines on treatment
- Ongoing watchfulness for infection, including TB symptoms
- Sometimes checking drug levels to guide dosing
- Reviewing whether to continue, adjust or switch treatment over time
- Coordinating care if surgery, pregnancy or other treatments are planned
Repeat, follow-on and what comes next
- Some people lose response over time and need a higher dose, shorter interval or a switch.
- Antibodies can develop against the drug, reducing its effect.
- Drug-level testing sometimes guides whether to adjust or change treatment.
- Trying more than one biologic before finding the right fit is common.
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
- Completed infection screening and an up-to-date vaccination plan before starting.
- A specialist IBD team with a named contact for infection concerns and flares.
- Clear written advice on infection symptoms and when to seek urgent help.
- Regular monitoring of response and safety, with drug-level testing where useful.
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:
- Which biologic is used and how often it is given
- Whether it is an infusion (needing a day unit) or a home injection
- Infection screening and vaccinations needed before starting
- Ongoing monitoring blood tests and specialist reviews
- Drug-level testing if used to guide dosing
- Management of any side effects or infections
- The cost of the medicine and how often doses are needed
- Whether infusion-unit or home-injection support is included
- Whether pre-treatment screening and vaccinations are included
- Whether monitoring blood tests and reviews are included or charged separately
- What happens, and what it costs, if the biologic does not work or must be switched
- How infections and side effects are managed and who to contact urgently
On the NHS? Biologics are provided on the NHS for eligible patients who meet NICE criteria, usually when other treatments have not worked; private treatment is also available, though these medicines are commonly delivered through specialist NHS services.
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
- Not being told about infection risk and the need for screening before starting.
- Not knowing which infections were screened for, or that hepatitis B can reactivate.
- Receiving a live vaccine while on treatment because it was not flagged.
- No clear plan for what to do if signs of infection or a reaction occur.
Marketing red flags
- Presenting biologics as without risks 'wonder drugs' without discussing infection risk.
- Starting treatment without proper screening or specialist oversight.
- Promising a cure or that the disease will never flare again.
- Downplaying the need for ongoing monitoring and vaccinations.
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.
- Which biologic are you recommending, and why is it the right one for me?
- What infections have I been screened for, and is my tuberculosis and hepatitis B status clear?
- What are the signs of infection I must report, and who do I contact urgently?
- Which vaccinations do I need before starting, and what must I avoid afterwards?
- How and when will we know if it is working, and what if it isn't?
- What are my options if this biologic stops working over time?
- 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
Why do I need so many tests before starting?
Will a biologic cure my Crohn's or colitis?
Is it given by a drip or an injection?
How much does it raise my risk of infection?
Can I have my normal vaccinations?
Are biologics 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: NHS — Treatment for Crohn's disease Crohn's & Colitis UK — Biologic medicines NICE — Infliximab and adalimumab for Crohn's disease (TA456) BSG consensus guidelines on IBD management — PMC Preparing IBD patients for anti-TNF therapy (screening) — PMC Biologic agents and tuberculosis risk — PubMed
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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