Baclofen

Baclofen: Easing Spasticity — and Never Stopping Abruptly

Baclofen is a centrally acting muscle relaxant that lowers muscle tone in spasticity caused by multiple sclerosis, spinal cord injuries or brain damage. It acts in the spinal cord, not in the muscle, which is why it often causes tiredness and weakness. If it is stopped suddenly after longer use — even unintentionally — hallucinations, seizures and a high fever can follow.

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Contents

  1. At a Glance: Technical Data Sheet
  2. How it works: a brake in the spinal cord
  3. Dosing: increase slowly, the goal is function
  4. Taking it in everyday life
  5. Side effects: tiredness, weakness, nausea
  6. Never stop abruptly: tablets and pump
  7. Interactions
  8. Check-ups and alternatives
  9. Special situations: kidneys, older age, epilepsy, pregnancy
  10. Baclofen experiences: what patients really ask
  11. FAQ: Common questions about baclofen

1. At a Glance: Technical Data Sheet

PropertyDetails
Active ingredientBaclofen
ATC codeM03BX01
Drug classCentrally acting muscle relaxant (myotonolytic), a derivative of the messenger substance GABA
Dosage forms5, 10 and 25 mg tablets; a solution for delivery into the spinal canal via an implanted pump (intrathecal)
Half-lifeAbout 7 hours according to the SmPC; excreted almost entirely via the kidneys
Maximum daily dose75 mg according to the SmPC; only rarely, usually in hospital, 90 to 120 mg. Your individual dose is set by the practice
Onset of effectPeak levels after about 2 hours; the effect on spasticity builds up over days to weeks as the dose is increased
Prescription statusPrescription-only medicine
Notable featureAfter longer use, it may only be stopped by tapering; with kidney impairment, signs of poisoning can occur even at low doses
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2. How it works: a brake in the spinal cord

Spasticity develops when nerve pathways in the brain or spinal cord are damaged — for example in multiple sclerosis, after a spinal cord injury or after a stroke. Normally, signals from above dampen the reflexes in the spinal cord. Without this inhibition, the reflexes overshoot: the muscles are constantly tense, the legs become stiff, and painful, sudden muscle spasms occur.

Baclofen is chemically related to the inhibitory messenger substance GABA and docks onto its GABA-B receptors, above all in the spinal cord. There it strengthens inhibition and dampens the onward transmission of excitation. Spastic muscle tone and overshooting reflexes decrease. Transmission from nerve to muscle itself remains unaffected.¹

  • Strengths: less stiffness, fewer and milder spasms, often better sleep, and easier care, personal hygiene and positioning.
  • Weaknesses: baclofen does not distinguish between "too much" tension and "useful" tension. It also dampens activity in the brain — hence tiredness, drowsiness and confusion — and it can weaken the muscle strength you still have.
An honest assessment. The guideline on multiple sclerosis notes that baclofen and the comparison drug tizanidine loosen spastic tone to a similar extent, but without leading to any functional gain — and that the evidence is poor overall.² So less tone does not automatically mean better walking. Some people even use their spasticity as a support when standing or transferring; if it is dampened too much, their legs give way.

Just as important is what baclofen does not treat: according to the SmPC, it is not suitable for muscle tension in rheumatic diseases, in Parkinson's disease or after injuries to peripheral nerves and muscles.¹ Ordinary muscle tension, back pain or night-time calf cramps are not spasticity — baclofen is neither licensed nor sensible for these.

3. Dosing: increase slowly, the goal is function

The following information reflects the SmPC and is not a dosing instruction. The dose and the pace of increase are set by the treating practice — often in coordination with physiotherapy.¹

  • Starting low is a must: the SmPC describes a low start with 15 mg a day, divided into several single doses. The dose is increased in small steps, at most every third day; in particularly sensitive people, treatment starts even lower.
  • Usual maintenance dose: mostly 30 to 75 mg daily, divided into two to four doses. The maximum daily dose is 75 mg; higher doses are used only rarely and usually in hospital.
  • Older and frail people: particularly slow increases, with close observation for tiredness, confusion and falls.
  • Kidney impairment: a considerably lower dose, and only very small amounts on dialysis — see section 9.
  • Children: dosing according to body weight, with separate upper limits, only under specialist supervision.
  • Taking stock: if no benefit is apparent after 6 to 8 weeks at the maximum dose, the SmPC says a decision should be made on whether to continue.

If tablets are not enough for severe spasticity or are not tolerated, baclofen can be delivered directly into the spinal canal via an implanted pump (intrathecally). There, a fraction of the tablet dose is enough, because the active ingredient passes only poorly from the blood into the cerebrospinal fluid.

The goal is function, not zero tone. Agree with your practice beforehand how you will measure success: fewer spasms at night, easier dressing, less pain, safe transfers, a longer walking distance. A spasticity diary kept over two or three weeks makes these goals checkable.

4. Taking it in everyday life

  1. Take it with meals. According to the SmPC, taking it with food or with milk improves stomach and bowel tolerability; absorption stays largely the same.
  2. Spread it evenly over the day. With a half-life of about seven hours, noticeable troughs develop between widely spaced doses — this often shows up as spasticity in the early morning.
  3. Do not take a double dose to catch up, but do not skip a series of doses either. Several missed doses in a row in particular can trigger signs of withdrawal.
  4. Keep an eye on your supply. Get your repeat prescription in good time, and when travelling take enough tablets in your hand luggage.
  5. Avoid alcohol. The SmPC explicitly describes the interactions with alcohol as unpredictable.¹
Driving and hazardous activities. Dizziness, drowsiness and visual disturbances can considerably impair your ability to drive, especially at the start and in combination with alcohol. According to the SmPC, whether and when you drive again is decided by the treating practice, taking your reaction and your dose into account. Background in the guide medications and driving.

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5. Side effects: tiredness, weakness, nausea

The side effects are dose-dependent and occur mainly at the start, when the dose is increased too quickly and at high doses. They are usually temporary and can be reduced by adjusting the dose.¹

  • Very common: nausea, drowsiness and sedation, especially in the first few weeks.
  • Common: vomiting, tiredness, dizziness, headache, tremor, unsteady gait, muscle weakness and muscle pain, visual disturbances, low blood pressure, dry mouth, constipation or diarrhoea, increased sweating, skin rash.
  • Mental health: commonly confusion (especially in older people), low mood, sleep problems, nightmares, euphoria or hallucinations.
  • Bladder: frequent urination, urgency or bedwetting; rarely urinary retention.
  • Breathing: according to the SmPC, depressed breathing is common — relevant above all in combination with other sedating medicines and in lung disease.
  • Other: a lowered seizure threshold, raised blood sugar, raised liver values; at high doses, central sleep apnoea (pauses in breathing during sleep) has been described.
Signs of an overdose or poisoning. Increasing drowsiness, confusion, disorientation, shallow or slow breathing, muscle twitching, seizures or clouding of consciousness: call 112 (emergency number in Germany) immediately. With impaired kidney function, according to the SmPC, these signs can appear even at daily doses above 5 mg.¹ Cases of brain dysfunction (encephalopathy) have also been reported at usual doses and resolved after the medicine was stopped.

The SmPC also reports suicides and suicide-related events on baclofen, mostly in people with additional risk factors such as alcohol problems, depression or previous suicide attempts, as well as cases of misuse and dependence.¹ Relatives should watch out for changes in mood. In an emotional crisis, TelefonSeelsorge (German crisis helpline) can be reached round the clock on 0800 111 0 111.

6. Never stop abruptly: tablets and pump

This is the most important section of this article. On baclofen, the nervous system adjusts to the additional inhibition. If it suddenly falls away, the balance tips towards over-excitation. According to the SmPC, sudden stopping or an abrupt dose reduction after several months of higher-dose treatment can lead to problems with concentration, delirium, confusion, hallucinations, agitation up to and including psychosis, seizures up to and including status epilepticus, a racing heart, fever, muscle breakdown (rhabdomyolysis) and temporarily increased spasticity.¹

The SmPC therefore provides that, after use for more than two to three months, baclofen should only be stopped by tapering it off over about three weeks — except in emergencies or in the case of serious side effects.¹ The exact schedule is set by the practice.

The real risk: the unplanned stop

Very few people stop baclofen deliberately. The dangerous situations are those in which the medicine stops without anyone noticing:

  • Hospital and surgery: fasting, swallowing problems or a medication plan from which baclofen is missing. At every admission, say explicitly that baclofen must not be paused — see medications before surgery.
  • Stomach bug: if you vomit up the tablets, you are effectively taking nothing. Get medical help if the vomiting persists.
  • Empty pack: weekend, public holidays, holiday, supply shortage — with baclofen, a reserve of a few days is not excessive caution.
  • A change of care: nursing home, rehabilitation, a new home care service. This is where long-term medicines get lost most often.

The pump: withdrawal as an emergency

With intrathecal treatment, the risk is particularly great, because the active ingredient acts directly on the spinal cord and the body has no reserve. According to the SmPC, the main causes of an interruption are catheter problems, a pump reservoir that has run too low or a device fault.³ Signs of withdrawal usually appear within hours to a few days.

Early warning signs with a baclofen pump. According to the SmPC, a return of the original spasticity, itching without a rash, low blood pressure and tingling or abnormal sensations are early signs of withdrawal.³ In that case, contact the pump centre looking after you or the emergency department immediately. A high fever, confusion or a change in consciousness and severe muscle stiffness can point to advanced, life-threatening withdrawal: call 112 (emergency number in Germany) and mention the pump.
  1. Treat refill appointments as non-negotiable and plan them with a buffer.
  2. Know the pump alarms: what does each tone mean, and whom do you call — at night, too?
  3. Carry an emergency card with the pump type, the dose and the contact details of the pump centre; see emergency card for medications.
  4. Let your relatives know: they often notice confusion or fever earlier than you do yourself.

The guide stopping medications describes how a planned taper generally works.

7. Interactions

Baclofen is hardly metabolised in the liver and is excreted almost entirely unchanged via the kidneys. Classic enzyme interactions therefore play hardly any role. The important combinations concern two areas: the dampening of the nervous system and kidney function.¹

CombinationConsequenceWhat to do
AlcoholUnpredictably increased sedation, risk of falls and accidentsAvoid
Opioids such as tramadol or tilidineIncreased tiredness, depressed breathingOnly in consultation with your doctor, start low
Sedatives and sleeping tablets such as lorazepamIncreased sedation, depressed breathingReview the combination critically
Gabapentin, pregabalinAdditional sedation and unsteady gaitA common combination in MS — watch for tiredness and falls
Sedating antidepressants, psychiatric medicines, other muscle relaxants such as tizanidineThey strengthen each other's effectsHave the overall burden assessed by a doctor
Blood pressure medicinesA greater drop in blood pressure, dizziness on standing upCheck blood pressure, adjust the dose if necessary
Medicines that strongly affect kidney function, such as some painkillers and anti-inflammatories used long-termBaclofen is excreted more slowly, risk of poisoningMonitor kidney values, adjust the baclofen dose
Table scrolls to the right

The table shows a typical problem for people with spasticity: they rarely take just one medicine. Baclofen for stiffness, gabapentin or pregabalin for nerve pain, plus a sleeping tablet and an opioid when needed — each justifiable on its own, but together a considerable dampening of alertness and breathing. This is particularly relevant at night and if there are already pauses in breathing during sleep. An interaction check across your whole list makes this sum visible.

The second point is the kidneys. Anything that reduces kidney function — dehydration in hot weather or with diarrhoea, certain painkillers used long-term, contrast agents — can cause baclofen to build up in the body. With such combinations, the SmPC calls for close monitoring of kidney function and an adjustment of the dose.¹

8. Check-ups and alternatives

What is checked regularly

  • Kidney function: before starting and over time, especially in older age and during acute illness.
  • Liver values and blood sugar: with liver problems or diabetes, the SmPC provides for regular laboratory checks.¹
  • Function rather than tone: walking distance, falls, daytime tiredness, sleep, bladder function — the values that really matter are found not in the laboratory but in everyday life.

Alternatives and additions

The guideline on multiple sclerosis puts regular physiotherapy first, supported by daily exercises of your own. Medicines are an addition, not a replacement.²

OptionUseTypical limitation
Physiotherapy, stretching, trainingThe basis of any treatment for spasticityNeeds regularity and time
Baclofen (tablet)First oral choice for generalised spasticityTiredness, weakness, risk on stopping
TizanidineEquivalent oral alternativeTiredness, drop in blood pressure, liver values
GabapentinFor sudden (paroxysmal) spasms and pain caused by spasticityTiredness, dizziness
Cannabis mouth spray (nabiximols)As an add-on in MS if other medicines are not enoughIts own side effects and questions of reimbursement
Botulinum toxinFor localised spasticity of individual muscle groupsThe effect wears off after months, repeat treatment needed
Baclofen pumpFor severe spasticity if tablets are not enough or are not toleratedSurgery, refill appointments, risk of withdrawal if something goes wrong
Table scrolls to the right

Baclofen and alcohol dependence

Baclofen keeps being discussed as a medicine against alcohol cravings. The German S3 guideline on alcohol-related disorders notes that baclofen is not licensed for this, rates the evidence on relapse prevention as inconsistent and recommends not using it to treat alcohol withdrawal.⁴ In addition, high doses come with considerable side effects, including central sleep apnoea. If you are looking for help with alcohol dependence, addiction counselling services and addiction medicine offer better-supported routes.

9. Special situations: kidneys, older age, epilepsy, pregnancy

  • Kidney impairment: baclofen is excreted almost entirely via the kidneys. With impaired function it is dosed cautiously and low; on dialysis, according to the SmPC, only 5 mg a day. The SmPC of the original product lists end-stage kidney failure as a contraindication. More under chronic kidney disease and medications for kidney and liver disease.
  • Older age: confusion, tiredness and muscle weakness weigh more heavily, and the risk of falls rises. Increase the dose slowly and know your kidney function.
  • Epilepsy: baclofen can lower the seizure threshold; the SmPC of the original product lists epilepsy and other seizure disorders as contraindications.¹
  • Pregnancy: there are no adequate studies; baclofen crosses the placenta. According to the SmPC, it may only be used if the benefit for the mother outweighs the possible risks. After use up to birth, withdrawal reactions up to and including seizures have been described in newborns — a pregnancy on baclofen should be planned early on, together with neurology and obstetrics.¹,⁵
  • Breastfeeding: baclofen passes into breast milk only in small amounts; according to the SmPC, no side effects are to be expected in the baby at usual doses.¹
  • Mental illness, Parkinson's disease, stomach ulcers, respiratory weakness: these can get worse or call for particular caution and closer monitoring.
  • Diabetes: baclofen can raise blood sugar; regular checks make sense.

10. Baclofen experiences: what patients really ask

"Since the dose was increased, my legs keep giving way. Is it working too well?"

Quite possibly. Many people with spasticity unconsciously rely on their raised muscle tone — when standing, when transferring from the wheelchair, when climbing stairs. If this tone is dampened too much, the support is missing and the legs give way. That is not a sign that the disease is progressing, but often an indication that the dose is too high. The solution is an adjustment, sometimes also a different distribution over the day. Do not cut the dose abruptly yourself, but report what you have noticed promptly — with the date of the last dose change.

"I forgot my tablets on holiday. How bad is that?"

After longer use, this needs to be taken seriously. One or two missed single doses are usually no drama, but several days without baclofen can trigger signs of withdrawal: restlessness, sleeplessness, increased spasticity, confusion and, in the worst case, hallucinations or seizures. So sort out a replacement straight away — through a doctor's practice, the out-of-hours medical service on 116 117 or a local hospital — and do not wait until symptoms appear. For the future, a low-stock alert that goes off before the pack is empty will help.

"Does baclofen also help with my back pain and calf cramps?"

No. Baclofen works against spasticity, that is, an over-excitability of the reflexes resulting from damage to the brain or spinal cord. Muscle tension with back pain, night-time calf cramps or muscle soreness have other causes. Baclofen is neither licensed nor sensible for these — the side effects and the risk on stopping would be out of all proportion. If you are offered baclofen for such complaints, ask for the reasoning.

"My pump needs refilling next week, but the appointment doesn't suit me."

Do not postpone the appointment without talking to the pump centre. The refill appointment is planned with a buffer before the reservoir runs empty, and that buffer is tight. A reservoir running empty is one of the most common causes of withdrawal in pump therapy. It is better to arrange a replacement appointment than to count on what is left — and know the early warning signs: returning spasticity, itching, tingling, low blood pressure.

Baclofen, gabapentin, sleeping tablets — how much sedation does that add up to?

The interaction check assesses your whole list, not just individual pairs.

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FAQ: Common questions about baclofen

The nervous system gets used to the additional inhibition. If it falls away abruptly, confusion, hallucinations, seizures, fever and increased spasticity can occur. According to the SmPC, after more than two to three months of use baclofen is therefore tapered off over about three weeks, following a plan from the treating practice.
Yes, drowsiness is one of the very common side effects, especially at the start and after dose increases. Starting low and increasing slowly makes it milder. Alcohol and other sedating medicines increase the tiredness considerably.
Each single dose takes effect within a few hours, but the right dose is worked out step by step over days to weeks. If no benefit is apparent after six to eight weeks at the maximum dose, the SmPC says a decision should be made on whether to continue.
No. Baclofen is licensed for spasticity resulting from diseases or injuries of the brain and spinal cord. For ordinary muscle tension, back pain or calf cramps it is neither licensed nor sensible; the side effects and the risk on stopping outweigh any benefit.
Only with a considerably adjusted dose and close monitoring. Baclofen is excreted almost entirely via the kidneys and can build up if kidney function is impaired. According to the SmPC, signs of poisoning such as drowsiness and confusion have been observed even at low daily doses.
Early signs of withdrawal are the return of spasticity, itching without a rash, low blood pressure and tingling. In that case, contact the pump centre or the emergency department immediately. A high fever, confusion and severe muscle stiffness are an emergency — call 112.
Better not. The SmPC explicitly advises avoiding alcohol at the same time, because the interactions are unpredictable. Tiredness, unsteadiness when walking and the risk of falls can increase considerably.

Sources

  1. Summary of Product Characteristics (SmPC) for Lioresal (baclofen) 5/10/25 mg tablets, as of January 2026; other baclofen generics accordingly — German source. fachinfo.de
  2. S2k guideline on the diagnosis and treatment of multiple sclerosis, neuromyelitis optica spectrum disorders and MOG-IgG-associated disorders (DGN, AWMF reg. no. 030-050, living guideline, as of 2026) — German source. awmf.org
  3. Summary of Product Characteristics (SmPC) for Lioresal Intrathecal (baclofen) solution for injection and infusion, current version — German source. fachinfo.de
  4. S3 guideline on the screening, diagnosis and treatment of alcohol-related disorders (DGPPN and DG-Sucht, AWMF reg. no. 076-001, 2020 version, validity extended) — German source. awmf.org
  5. Embryotox — German pharmacovigilance and advisory centre for embryonic toxicology (Charité Berlin): baclofen in pregnancy and breastfeeding. Accessed 2026. embryotox.de

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Medical disclaimer: This article is for general information and does not replace medical advice, diagnosis or treatment. Never stop baclofen abruptly after longer use, and make sure it does not drop out unnoticed in hospital, when you are vomiting or while travelling. If you have confusion, hallucinations, seizures, a high fever, severe drowsiness or shallow breathing, call 112 (emergency number in Germany) immediately; if you have a baclofen pump, mention the pump. The choice of medicine and the dose are always set individually by the treating practice. Last updated: September 2026.