Intrathecal baclofen assessment

What is an intrathecal baclofen assessment?

Baclofen is a medicine that relaxes very stiff, overactive muscles (spasticity). Taken as tablets it spreads through the whole body, and the dose needed to calm severe spasticity can cause drowsiness, weakness or dizziness before it works well enough.

An intrathecal baclofen (ITB) assessment is a test, not the treatment itself. 'Intrathecal' means into the fluid around the spinal cord. A specialist puts a single test dose of baclofen straight into that fluid, usually through a lumbar puncture (a fine needle in the lower back), and then watches over several hours to see whether your stiffness and spasms ease. Putting the drug where it is needed means a much smaller dose can work with fewer whole-body side effects.

The test answers one question: is your spasticity likely to respond to intrathecal baclofen? It does not, on its own, treat you long-term. If the test works well and the benefit matches goals that matter to you, the next step is a separate decision about whether to have a small pump implanted to deliver baclofen continuously.

This is a specialist, trial-first pathway for severe spasticity that ordinary measures and tablets have not controlled. It is used in conditions such as multiple sclerosis, spinal cord injury, brain injury, cerebral palsy and sometimes after stroke. It is not a cure for the underlying condition, and not everyone who is tested goes on to have a pump.

Types, options & approaches

There may be different ways to do this. The right approach depends on the clinical question and your circumstances.

Baclofen tablets compared with intrathecal baclofen

Intrathecal baclofen is usually only considered when tablets and other measures have not controlled severe spasticity, or cause too many side effects. The assessment is how the team checks it is likely to help before committing to a pump.

Preparing for your test

• Be ready to discuss what you most want to change — for example easier care and positioning, less pain from spasms, or better movement — as the test is judged against your goals.
• Bring a full list of your medicines, including baclofen tablets and any other muscle relaxants or strong painkillers.
• Tell the team about bleeding problems, blood-thinning medicines, infections, breathing problems or previous spine surgery, as these affect the lumbar puncture and safety.
• Expect a short hospital stay and arrange for someone to take you home, as you should not drive afterwards.
• Ask whether any of your usual medicines need to be paused, and follow the instructions you are given.
• Plan for the day or two after the test, as some people get a headache after a lumbar puncture.
• Have your questions written down — especially what a 'good enough' result looks like and what happens if the test does not help.

What happens

The assessment is usually done as a planned hospital visit by a specialist spasticity or neurorehabilitation team. Before the test, a doctor and physiotherapist examine your muscles, stiffness, spasms and movement so they have a clear 'before' picture to compare against.

A single test dose of baclofen is injected into the fluid around the spinal cord, most often through a lumbar puncture in the lower back using local anaesthetic. Some centres instead place a fine temporary catheter, which may be done under general anaesthetic. The team then watches you closely over the next few hours.

Baclofen given this way usually starts to work within a couple of hours and wears off within several hours. During that window the team reassesses your stiffness and spasms (often using simple scoring scales), checks how you feel, and watches for side effects such as drowsiness, weakness, low blood pressure or breathing changes. You will usually have your pulse, blood pressure and oxygen monitored.

Afterwards the team discusses what they saw with you. A clear, useful reduction in spasticity that matches your goals suggests a pump may help. A small or unhelpful response, or one that causes too much weakness, suggests a pump is unlikely to be worthwhile. The decision about a pump is taken separately and is not automatic.

Is this test 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.

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.

Comfort, sedation or contrast choices

If local anaesthetic, sedation, contrast or pain relief is used, ask what is planned, why, and what it means afterwards.

The main thing this test is designed to manage is the powerful effect of baclofen in the spinal fluid, which is why you are watched in hospital with your breathing and blood pressure monitored. Tell the team straight away if you feel very drowsy, unusually weak, short of breath or faint. If you rely on a degree of stiffness to stand or transfer, mention this, because relaxing the muscles can briefly affect how you move.

Published figures to discuss

How well intrathecal baclofen works, and how big the risks are, depends on the cause and pattern of spasticity, the dose, other health problems and how carefully the pump is managed afterwards. The test gives information about likely response rather than a guaranteed outcome, so this guide describes most risks in plain words rather than precise percentages, and treats spasticity scoring scales as a guide, not a promise. Where a defensible figure exists for the pump, it is given cautiously.

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

There is no operation in the assessment itself and usually nothing to physically recover from beyond the lumbar puncture. 'Afterwards' mostly means waiting for the baclofen to wear off, recovering from any headache, and talking through what the result means.

• Feeling more relaxed, drowsy or 'floppy' for a few hours after the dose
• Your usual stiffness and spasms returning as the baclofen wears off
• A mild headache or sore lower back for a day or two
• Mixed feelings — relief if it helped, disappointment if it did not — which the team can talk through
• No lasting change from the test itself, because it is a trial rather than a treatment

Aftercare

• Rest for the remainder of the day and avoid driving while you feel drowsy.
• Drink plenty of fluids and use simple painkillers as advised if you get a headache.
• If you had a lumbar puncture, follow any advice about lying flat and gentle activity.
• Keep using your usual spasticity treatment, including baclofen tablets, unless told otherwise.
• Note how your body responded — what eased, what felt too weak — and share this with the team.
• Contact the team if a headache is severe or persistent, or if you feel unusually drowsy or weak.
• Wait for the planned discussion about next steps before making any decision about a pump.

• Someone to take you home and stay with you that day
• Time booked off work or activities for the test day and the day after
• Simple painkillers at home for a possible headache
• Your usual medicines and spasticity treatment to continue
• A note of your goals and what 'better' would mean for you
• The team's contact number saved in case of side effects
• A follow-up plan agreed for discussing the result

Scars and how they heal

A lumbar puncture leaves only a tiny needle mark in the lower back, which may bruise but does not usually leave a scar. If a temporary catheter is placed there may be a small dressing for a short time. A permanent pump, if you later choose one, is a separate operation that does leave a scar on the abdomen.

⚠ Get urgent help if…

• Severe drowsiness or being hard to wake after the dose
• Difficulty breathing or very slow, shallow breathing — seek emergency help
• Severe or sudden weakness, especially affecting movement or swallowing
• Fainting, a very low pulse or feeling extremely unwell
• A severe, worsening headache, or a headache with neck stiffness, fever or a rash
• Signs of infection at the puncture site such as spreading redness, heat or discharge
• Any symptom that frightens you in the hours after the test — tell staff immediately

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 useful result is a clear, worthwhile reduction in your stiffness and spasms that matches goals that matter to you — such as easier care and positioning, less pain, more comfortable sitting, or better movement — without unacceptable weakness or drowsiness. That kind of response is what makes an implanted pump worth considering.

A small, short or unhelpful response, or one that takes away stiffness you rely on, suggests a pump is unlikely to help and is an equally valid, important result. The test tells you about likely response; it cannot promise how a pump will perform day to day, and it does not change the underlying condition.

The test dose itself wears off within hours and is not a lasting treatment. Its value is the information it gives. If you go on to have a pump, the benefit then depends on the pump working, the dose being adjusted over time, and regular refills and reviews continuing for as long as the pump is in place.

Related tests, treatments or support

Intrathecal baclofen is usually one part of a wider spasticity plan that also includes physiotherapy, stretching and positioning, and sometimes botulinum toxin injections for focal stiffness or other medicines. The assessment is done within that bigger picture, so the team can judge what the pump would add on top of everything else.

Follow-up & long-term care

After the test you should have a planned discussion of the result and what it means. If a pump is recommended, you will be referred for the implant operation and given a clear plan for refills (typically every few months), dose adjustment and who to contact in an emergency. If a pump is not recommended, the team should set out the alternatives and continue your spasticity care.

• If a pump is later fitted, it needs regular refills (commonly every few months) at a clinic
• The pump battery lasts a number of years and is then replaced with a further operation
• The dose is adjusted over time to balance benefit against weakness and side effects
• You must keep refill appointments, because running empty can cause dangerous withdrawal
• You need a clear emergency plan for signs of overdose or withdrawal

Repeat, follow-on and what comes next

• The test may need repeating with a higher dose if the first response is unclear.
• A positive test does not commit you to a pump — the decision is made separately with you.
• If a pump is fitted, the dose is adjusted over time and the device and battery are eventually replaced surgically.
• Some people who respond on the test still choose not to have a pump once the surgery, refills and follow-up are explained.

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

• A clear written record of how you responded and what it means for next steps.
• Honest, goal-based discussion of whether a pump is worthwhile for you specifically.
• If a pump is fitted: a named contact, a refill schedule and a written emergency plan for overdose and withdrawal.
• Joined-up care with your neurology, rehabilitation and physiotherapy teams and your GP.
• Easy, fast access to specialist help if pump problems or new symptoms occur.

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:

• Whether the test is a single lumbar puncture dose or a longer temporary-catheter trial
• The length of the hospital stay and level of monitoring needed
• Input from the specialist team, including doctor, nurse and physiotherapist assessments
• Any imaging or tests needed before the procedure
• Follow-up appointments and reports after the test
• The separate, much larger cost of pump surgery, the device, refills and long-term follow-up if you proceed

• Whether the assessment is a single test dose or a catheter trial, and the expected length of stay
• Who carries out and supervises the test, and their specialist experience in spasticity
• What monitoring is included during and after the dose
• What happens, and what it costs, if the test is inconclusive or needs repeating
• A clear, separate explanation of pump surgery, the device, refills and lifelong follow-up costs if you proceed
• Who provides emergency cover for overdose or withdrawal once a pump is in place
• How results and recommendations are shared with your other clinicians and GP

On the NHS? Intrathecal baclofen assessment and pumps are provided on the NHS through specialist spasticity and neurorehabilitation services for people who meet the criteria; access and waiting times vary because these are specialist 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.

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.

How Vuemedics verifies every consultant →

Take this to your consultation. A good specialist will welcome every one of these.

• What would count as a 'good enough' response for me, and how will you measure it?
• Do I rely on any of my stiffness to move or transfer, and could the test take that away?
• If the test works, what does the pump operation, refill schedule and follow-up actually involve?
• What are the risks of baclofen overdose and of sudden withdrawal, and what is the emergency plan?
• What happens if the test does not help — what are my other options?
• Who looks after the pump long-term, and how quickly can I be seen if something goes wrong?
• 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 test, 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 test 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?

Find a verified specialist for intrathecal baclofen assessment

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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: Leeds Teaching Hospitals NHS Trust — Intrathecal baclofen Alder Hey Children's NHS Trust — Intrathecal baclofen (ITB) test dose and pump MS Society — Spasticity and muscle spasms in MS British Society of Rehabilitation Medicine — Spasticity guidance Intrathecal baclofen for spasticity: evidence-based analysis — PMC

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.