Myorel

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Myorel

Property Description
Active ingredient Baclofen (a GABA derivative)
Form Tablet (Oral), Solution (Intrathecal)
Pharmacological Class Centrally Acting Skeletal Muscle Relaxant
General Purpose Reduction of muscle hypertonia and spasticity
Origin Synthetic Compound

What Type of Medicine is Myorel? (Identity and Classification)

Myorel is a prescription-only pharmaceutical preparation containing the single active ingredient, Baclofen. It is scientifically classified as a centrally acting skeletal muscle relaxant and a specific antispastic agent, a designation used for drugs that directly address increased muscle tone and spasms. This therapeutic benefit is clinically recognized across major neurology and pharmacology texts.

Baclofen is a synthetic compound that functions by acting as an agonist on the GABAB receptors, primarily in the spinal cord. It is used in the treatment of spasticity, working by calming nerve activity in the spinal cord. This means the medication helps to ease muscle tightness and reduce the frequency of involuntary spasms by controlling signals from the central nervous system.


Composition, Origin, and Available Forms (The Substance and Presentation)

The composition of Myorel centers entirely on the active ingredient, Baclofen, an exclusive synthetic molecule. It is offered in two principal dosage forms: the tablet for oral administration and a sterile solution for intrathecal injection.

The distinction in delivery method is a key differentiating feature of Baclofen compared to many other muscle relaxants. Intrathecal administration of Baclofen allows for the drug to be delivered directly into the spinal fluid. This is a highly specific method used when stiffness and spasms are intense and unresponsive to the standard oral tablets, particularly in complex patient groups.


What is Myorel's General Purpose? (High-Level Therapeutic Role)

The general therapeutic purpose of Myorel is to decrease pathologically increased muscle hypertonia (excessive muscle tone) and reduce the severity of painful spasticity. Its function as an antispastic agent means it is fundamentally designed to lessen the chronic, involuntary muscle tightening and stiffness that arise from conditions affecting the central nervous system. A typical use scenario involves managing the ongoing muscle rigidity in patients who have experienced a spinal cord injury. This action provides relief from associated discomfort, pain, and limitations in movement.

What side effects are possible with Myorel?

Possible side effects and safety information

The safety profile of Myorel (Baclofen) primarily reflects its actions on the central nervous system (CNS). Adverse reactions are formally documented and categorized by regulatory authorities, and many are often noted at the initiation of treatment.

Officially Documented Adverse Reactions

Adverse effects are documented across several System Organ Classes (SOCs). The most frequently reported reactions are related to the Nervous System.

Classification Examples of Reactions (Based on Regulatory Labeling)
Very Common Drowsiness, Sedation
Common Dizziness, Weakness, Fatigue, Headache, Insomnia, Nausea, Constipation, Dry mouth, Urinary frequency
Other SOCs Gastrointestinal (Vomiting, Abdominal pain); Genitourinary (Urinary retention, Impotence); Psychiatric (Confusion, Depression, Hallucinations)

These common effects are often reported in a dose-related manner. Official safety documents state that these effects are frequently mild and tend to diminish after the first few days of continuous use.

Serious Adverse Reactions and Safety Constraints

The most significant and severe safety consideration is the risk of Abrupt Withdrawal Syndrome. If the medication is suddenly discontinued, severe adverse reactions may occur, including high fever, exaggerated spasticity, altered mental status, and a risk of seizures and hallucinations. Regulatory labels specify that the dose must be slowly reduced to prevent this life-threatening syndrome.

Specific population considerations are also documented:

  • Older Adults: May exhibit increased sensitivity to CNS effects, such as severe drowsiness and confusion.
  • Renal Impairment: Effects may be increased due to slower drug clearance from the body.

Safety documents also advise caution when used concurrently with alcohol or other CNS depressants due to potentially additive CNS depressant effects.

Overdose and Emergency Response

Overdose Map: Overdose and When to Seek Help — Official Regulatory Information for Myorel (Baclofen)

Overdose Scope

Domain Official Regulatory Statement
Documented Overdose Presentations Symptoms include profound drowsiness, somnolence, confusion, dizziness, and severe muscle flaccidity (hypotonia). Nausea, vomiting, and seizures are also documented.
Physiological Systems Affected (As Stated in Label) Primarily the Central Nervous System (CNS), leading to respiratory depression and coma. Also affects the Cardiovascular System, causing hypotension and potential circulatory collapse.
Dose-Related or Exposure-Related Factors (If Applicable) Overdose can occur from excessive oral ingestion or due to errors in intrathecal administration.
Population-Specific Overdose Notes (If Applicable) Patients with impaired renal function are identified as having an increased risk for toxicity due to the drug’s primary excretion route.
Emergency-Response Statements (As Written in Official Documents) The patient should be taken immediately to a hospital for assessment when overdose is suspected. For intrathecal overdose, the specialist managing the pump must be consulted immediately.
When Immediate Medical Help Is Required (Label-Derived Phrasing Only) Immediate medical attention is required due to the possibility of potentially life-threatening CNS depression, respiratory failure, and cardiovascular collapse.

Overdose Classifications (High-Level)

Classification Official Regulatory Statement
Severity Classification (as defined in official documents) Overdose is classified as potentially severe or life-threatening.
Regulatory Basis (EMA / FDA / etc.) Information derived from FDA Prescribing Information and authoritative NIH medical monographs.
Overdose-Context Constraints (as defined in official documents) No specific antidote is known; management relies on symptomatic and supportive treatment.

Resulting Overdose Structure

Official Overdose Statements:

  • Overdose may present with CNS depression including somnolence and loss of consciousness progressing to coma.
  • Life-threatening consequences include respiratory failure and cardiovascular collapse.
  • Symptomatic and supportive treatment is the officially mandated approach, including airway management, due to the absence of a known specific antidote.

Connection to the overall overdose profile: The regulatory documents define the overdose profile by outlining a rapid sequence of neurological and respiratory depression that necessitates immediate emergency medical care. Management is restricted to supportive measures and continuous hospital observation due to the officially stated absence of a specific pharmacological antidote.

Therapeutic Uses of Myorel

Myorel is used for managing muscle overactivity linked to neurological conditions. Its therapeutic role centers on addressing three key domains of symptoms that interfere with daily functioning. The medication is used to treat spasticity that arises from conditions affecting the central nervous system.


Managing Chronic Muscle Stiffness and Hypertonia

Myorel is relevant for managing symptoms associated with conditions such as Multiple Sclerosis (MS), Spinal Cord Injury (SCI), and Cerebral Palsy (CP). The medication is relevant for easing persistent, excessive muscle tone (hypertonia) and rigidity, which may lead to stiffness. This may help to ease the functional strain of continuous muscular resistance, supporting comfort.

Quick Fact: Relief for Neurological Spasticity


Reducing Painful Spasms and Involuntary Jerking

The medication is applied in addressing severe, involuntary muscle spasms (such as flexor and extensor) and clonus (rhythmic jerking). These symptom clusters often lead to significant physical discomfort. The medication is relevant for easing the symptoms of increased neurological or muscular activity, supporting comfort and helping maintain a sense of stability during symptomatic periods.


Supporting Mobility and Rehabilitation

Myorel provides support relevant for functional benefit, particularly for patients undergoing physical therapy. The drug is applied in clinical settings to help support muscle movement and facilitate positioning. This assists with maintaining functional stability and may assist with managing symptoms that interfere with daily functioning, such as bathing or transferring.

Eligibility and Restrictions for Use

Who Can and Cannot Use Myorel?

The eligibility for Myorel (baclofen) is strictly defined by regulatory authorities based on contraindications, age, and pre-existing medical conditions.


Contraindications (Must Not Use)

Category Official Restriction
Hypersensitivity Patients with known allergy to baclofen or any of the inactive ingredients.
Excipients Patients with rare hereditary problems like galactose intolerance or Lapp lactase deficiency (for tablet forms).
Peptic Ulceration Use is contraindicated according to some official labeling (while others list it as a caution).

Conditional Use and Restrictions

Population/Condition Restriction
Renal Impairment Restricted use; requires close monitoring and a reduced daily dosage. Use in end stage renal failure is generally avoided unless benefits outweigh high risk of toxicity.
Age Groups Children weighing below 33 kg are unsuitable for tablets. Older adults (ge 65 years) require a cautious regimen due to a higher risk of adverse effects.
Psychiatric/Neurological Use with caution in patients with psychotic disorders, schizophrenia, Parkinson's disease, or a history of epilepsy, as these conditions may be exacerbated.
Pregnancy/Lactation Not established as safe; should be administered during pregnancy only if the potential benefit justifies the risk, as neonatal withdrawal has been reported. Baclofen passes into breast milk, requiring monitoring of the infant.

These limitations establish clear boundaries for Myorel use: it is absolutely forbidden for certain patient groups and requires mandatory, close supervision for individuals with specific organ impairments or psychiatric/neurological comorbidities.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Pharmacodynamic Interactions

The most commonly documented interaction pattern for Myorel involves pharmacodynamic reinforcement of central nervous system (CNS) depressant effects. Co-administration with alcohol and other CNS depressants may result in additive depressant effects.

Officially documented interacting classes and substances include:

  • Other CNS Depressants: Such as opioid pain medications, benzodiazepines, and other muscle relaxants.
  • Tricyclic Antidepressants: Co-administration may lead to an increased risk of muscle hypotonia (abnormally low muscle tone).

Pharmacokinetic and Population-Specific Constraints

The regulatory profile identifies interactions that affect Myorel’s concentration in the body.

Interaction Type Interacting Substance/Condition Official Outcome
Drug-Food (Pharmacokinetic) High-fat meal Decreases peak plasma concentration ( C max) by 29% to 33% and systemic exposure ( AUC) by 9% to 10%.
Drug-Condition (Clearance) Impaired Renal Function Results in reduced drug clearance and increased systemic exposure, which heightens the risk of toxicity and magnifies CNS depressant interaction effects.
Drug-Drug (Clearance) Products that significantly impact renal function Caution is required due to the potential for increased Myorel accumulation.

No mandatory timing separation rules are explicitly documented for co-administration with other medicines or food.

Mechanism of Action

Myorel functions centrally by targeting and acting as an antagonist at the gamma-aminobutyric acid type A ( GABA A) receptor complex, primarily localized on inhibitory interneurons within the central nervous system, including the spinal cord and brainstem. This competitive interaction impedes the binding of the endogenous agonist GABA, thereby reducing the frequency and duration of chloride ion left( Cl^- ight) channel opening. The resulting diminished chloride influx leads to a reduction in postsynaptic hyperpolarization. This cellular consequence translates to a decrease in the inhibitory postsynaptic potential (IPSP) of motor neurons. The downstream cascade is a modulation of polysynaptic reflex arcs, resulting in a systemic reduction in elevated muscle tone and a decrease in muscle fiber resistance to passive stretch.

Dosage and Administration Information

How to Use Myorel

Myorel is administered through two officially approved routes: the Oral route (systemic use via tablets or solutions) and the highly specialized Intrathecal route. The oral dosage regimen is structured around a gradual titration process to establish an individualized maintenance level. Treatment typically begins with a low dose, such as 5 mg three times daily (t.i.d.), with subsequent dose increases of 5 mg per dose occurring every three days. This titration proceeds until the optimal response is achieved, while adhering to a maximum recommended daily dosage of 80 mg. Oral forms may be taken with or without food and must be administered in divided amounts at evenly spaced intervals throughout the day.

The Intrathecal route involves the continuous infusion of a sterile solution directly into the spinal fluid using a surgically implanted pump system. This specialized route requires close medical supervision for screening, implantation, and all subsequent dose adjustments. Dosing in this context is continuous, whereas the oral regimen follows a multiple-times-daily frequency pattern. Specific dosage adjustments are required for certain populations; for instance, patients with renal impairment must be initiated on lower doses, with a particularly low daily dose used for those undergoing dialysis.

Treatment with Myorel is typically intended for long-term continuous use. The official use protocol dictates a critical constraint for the full course of therapy: the medication must not be stopped abruptly. Upon completion or review of the need for therapy, the dosage must be tapered gradually over a period of time to formally conclude the use protocol.

Recent Clinical Evidence

Evidence Overview for Spasticity in Multiple Sclerosis (MS)

Research exploring Myorel's use for spasticity related to Multiple Sclerosis (MS) has included short-term Randomized Controlled Trials (RCTs) and various systematic reviews. These trials were primarily used to study how symptoms evolved over defined time intervals, typically up to 12 weeks for the oral form. Researchers focused on outcomes related to physical discomfort, specifically measuring changes in muscle tone and stiffness and monitoring the frequency of involuntary spasms in adult populations.

Studies conducted during these defined time intervals reported findings describing patterns observed in the study populations, particularly in terms of changes measured in muscle tone scores. The findings were consistently used by regulatory bodies in characterizing the research base for the core symptoms of spasticity (tone and spasms).

However, follow-up durations were limited in the primary controlled trials. Long-term functional outcomes, such as sustained changes in walking ability or overall daily life functioning, are not consistently documented in the existing evidence.


Evidence Overview for Spasticity in Spinal Cord Injury (SCI)

The research base for spasticity resulting from a Spinal Cord Injury (SCI) was evaluated in studies that include both standard RCTs and important long-term observational cohorts, particularly for patients using the implanted pump (intrathecal) delivery system. These studies explored whether patterns related to muscle tone, spasms, and functional outcomes changed in the study populations.

Studies monitored how muscle tone scores evolved in the observed populations, and data show patterns related to changes in the severity of both flexor and extensor spasms. For the intrathecal delivery method, long-term observational evidence suggests that the patterns related to symptom changes were maintained over several years in some studies.

While changes in symptom measures were observed, the complexity of determining major improvements in outcomes reflecting daily functioning across all analyses means certainty remains low regarding the consistency of functional improvements.


Evidence in Special Populations and Uncertainties

The research conducted for severe spasticity of cerebral origin included a focus on the pediatric population, particularly those whose spasticity was refractory (unresponsive) to previous oral treatment. Research examined children with conditions marked by functional limitations, but the data available involved modest sample sizes. Evidence for these certain groups remains insufficient.

Across all indications, evidence quality varies, and findings were mixed in certain sub-populations. Sample sizes were modest in some groups, and data for certain groups remain insufficient. These factors contribute to the recognized need for further research, particularly for conditions characterized by fluctuating or episodic manifestations.

Key Studies & References

  1. Intrathecal baclofen for severe spasticity: a meta-analysis.

Frequently Asked Questions (FAQ)

Common questions about Myorel (FAQ)


Q: What is the main reason Myorel is prescribed?

Official prescribing information indicates that Myorel is used for the management of spasticity (involuntary stiffness and tightness of the muscles).

This muscle stiffness typically results from serious conditions such as multiple sclerosis or spinal cord injury.


Q: How quickly can I expect Myorel to start working?

Official information describes the onset of action for the oral forms as typically occurring within one hour.

The peak effects of the medication are generally reached within two to three hours after a dose is taken.


Q: What is the typical length of time people take Myorel for?

Regulatory documents state that Myorel is intended for long-term continuous use to manage chronic spasticity.

The total duration of therapy is ultimately determined by the healthcare team based on the patient's condition and response.


Q: Is Myorel the same as other medicines with similar names?

Myorel is the brand name for the generic compound [Generic Name].

This generic compound is also available in a generic formulation, and other brand names may also be used for the same active ingredient.


Q: Is Myorel generally well-tolerated?

Tolerability is described in official terms through the frequency of adverse events observed in studies.

Common side effects such as drowsiness and dizziness are frequently reported, especially when treatment begins.


Q: What are the most commonly reported side effects of Myorel?

The most frequently reported adverse reactions found in regulatory documents include drowsiness, dizziness, nausea, and general weakness.

Official prescribing information contains a detailed and complete list of all adverse effects observed.


Q: Is it common to feel dizzy or lightheaded after taking Myorel?

Dizziness is listed as a commonly reported adverse reaction in the official prescribing information for Myorel.


Q: Does Myorel affect sleep or cause drowsiness?

Drowsiness is listed as one of the most frequently reported side effects in official documents for Myorel.

Warnings indicate that patients should be aware of their reaction before engaging in complex tasks.


Q: Does Myorel cause changes in mood or anxiety levels?

Reported adverse events include insomnia, depression, and agitation.

This suggests a potential effect on mood and anxiety levels, as noted in the official documentation.


Q: Is there a link between Myorel and headaches?

Headache is listed as one of the commonly reported adverse reactions in the official prescribing information for Myorel.


Q: Does taking Myorel cause dry mouth?

Dry mouth is listed as a commonly reported adverse reaction in the official prescribing information for Myorel.


Q: Does Myorel cause weight gain or weight loss?

Weight gain is listed as an infrequent but reported adverse reaction in long-term therapy described in regulatory documents.


Q: Are there any known long-term side effects associated with Myorel?

The prescribing information details adverse reactions observed, which include potential effects associated with long-term therapy.

These can involve issues related to psychiatric or kidney function.


Q: What does official documentation say about the safety of Myorel?

The documentation outlines the safety profile of Myorel, noting risks such as central nervous system depression.

It also highlights the risk of physical dependence and withdrawal symptoms upon abrupt cessation.


Q: What should be done if a severe side effect is experienced while on Myorel?

Official patient information requires that you seek immediate medical attention if symptoms of a severe adverse reaction are experienced.


Q: What is the experience of stopping Myorel like?

Official protocols warn that abrupt discontinuation can lead to severe withdrawal symptoms, including hallucinations and seizures.

Regulatory guidance requires the dosage to be tapered gradually under medical supervision.


Q: Does Myorel have a risk of dependence or addiction?

Regulatory documents include warnings about the risk of developing physical dependence with Myorel.

Because physical dependence is a risk, gradual reduction is required by regulatory guidance to prevent withdrawal reactions.


Q: Is it possible to develop a tolerance to Myorel over time?

Official documents note that tolerance to the therapeutic effects may develop over the course of treatment.

This is particularly noted in patients receiving long-term use of the medication.


Q: Are there foods or drinks that should be avoided while using Myorel?

Official documents require caution regarding alcohol due to the potential for additive depressant effects on the central nervous system (CNS).

It is also noted that taking the oral form with a high-fat meal can slightly reduce the maximum concentration of the medication in the body.


Q: Are there any common over-the-counter medicines that interact with Myorel?

Official documentation focuses on interacting drug classes rather than providing an exhaustive list of all over-the-counter (OTC) products.

Official information highlights the risk with products known to cause drowsiness or contain alcohol.


Q: Can people who drive or operate machinery take Myorel?

Official warnings state that Myorel may cause sedation, dizziness, and other CNS effects.

The medication carries warnings that the ability to safely drive or operate complex tasks may be impaired due to these effects.


Q: Does Myorel affect mental clarity or concentration?

Adverse events reported include confusion and impaired judgment.

The reporting of these adverse events is consistent with a potential impact on mental clarity and concentration.


Q: What happens if a dose of Myorel is missed?

Official patient information provides guidance to take the missed dose as soon as it is remembered.

However, if it is almost time for the next scheduled dose, the recommendation is that the missed dose should be skipped.


Q: What are the contraindications listed for Myorel in official documents?

Official contraindications typically include hypersensitivity (severe allergic reaction) to the drug substance.

These are conditions under which the medication should generally not be used.


Q: Are there specific age groups that cannot use Myorel?

Official documents state that the oral form is generally not recommended for use in children under the age of 12 years.

This is based on the official pediatric safety information.


Q: Can women who are planning to become pregnant use Myorel?

Official guidance requires that use during pregnancy generally be avoided.

This is based on official reproductive studies and unless a healthcare provider determines the potential benefits outweigh the potential risk to the fetus.


Q: Is Myorel safe for older adults to take?

Official information notes that older adults may require lower doses of Myorel.

Closer monitoring is necessary due to an increased potential for adverse effects in this patient population.


Q: Can Myorel be used safely by people with high blood pressure?

Official documents state that caution is required when Myorel is administered to patients with a history of hypertension (high blood pressure) or cerebrovascular disease.


Q: Is Myorel suitable for individuals who have liver issues?

Official guidance states that dose adjustments are typically not required for patients with hepatic (liver) impairment.

This is because the drug is primarily eliminated unchanged by the kidneys, not heavily metabolized by the liver.


Q: Are patients required to have follow-up tests while taking Myorel?

Official documents recommend monitoring in certain patient populations to check for potential adverse effects.

This includes patients with conditions like epilepsy or renal impairment.


Q: Do you need a special prescription to get Myorel?

Myorel is classified as a prescription-only medicine (POM).

It requires a valid prescription from a licensed healthcare provider for dispensing.


Q: Is there a patient brochure or detailed official information available for Myorel?

Detailed official patient information is available as a Medication Guide or Patient Information Leaflet.

This documentation is typically provided by the pharmacy when the prescription is dispensed.


Q: What is the difference between an official and an unofficial source of Myorel information?

Official information is created and reviewed by government regulatory authorities (e.g., FDA, EMA) and is based on controlled clinical trial data.

Unofficial sources, such as blogs or forums, are not subject to the same regulatory standards for evidence and compliance.


Q: What kind of research has been done on Myorel?

Studies described in official summaries typically involve double-blind, placebo-controlled trials.

This type of research is used to examine the reduction of muscle spasticity and related pain compared to a non-active treatment.


Q: What kind of studies support the effectiveness of Myorel?

Efficacy is supported by results from randomized, controlled clinical trials.

These studies demonstrate the reduction of muscle tone and spasm frequency when compared against a placebo (an inactive substance).


Q: What is the general success rate described in clinical trials for Myorel?

Success rates are typically reported in clinical trials based on the percentage of patients achieving a defined level of reduction in spasticity score on a standardized scale compared to placebo.

These measurements are detailed in the official efficacy data.


Q: Is Myorel ever used as a preventative measure?

Official indications specify the drug is used for the management of spasticity.

This indicates it is a treatment measure for an existing condition rather than a preventative one.


Q: What are the signs that Myorel is working?

The drug's expected action includes a reduction in the frequency and severity of muscle spasms.

Other expected effects are a decrease in muscle stiffness and an improvement in passive range of motion.


Q: Why is Myorel classified as a [Insert relevant drug class/schedule]?

Myorel is officially classified as a centrally acting skeletal muscle relaxant.

This classification is due to its specific mechanism of action on the central nervous system.

How should Myorel be stored and disposed of?

How to Store and Dispose of Myorel

The storage of Myorel (Baclofen) must adhere strictly to the conditions specified on the regulatory label, which vary based on the dosage form.

Storage Requirements

Dosage Form Required Storage Condition
Oral Tablets/Granules Controlled Room Temperature: 20 C to 25 C (68 F to 77 F)
Oral Solutions Either Refrigerated (2 C to 8 C) or Room Temperature (Formulation dependent)

All forms must be protected from freezing, excessive heat, and moisture. The medicine must be kept in its original container, tightly closed, and stored out of the sight and reach of children. Specific oral suspensions must be discarded 60 days after the bottle is first opened.

Disposal Instructions

Unused or expired Myorel should be disposed of using a community drug take-back program. The medication must not be flushed down a toilet or poured down a drain unless explicitly authorized by regulatory guidance.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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