Yurelax

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Yurelax

Method of action: Miorelaxant, Muscle Relaxant

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 Yurelax

Quick Facts about Yurelax

Property Description
Active ingredient Cyclobenzaprine Hydrochloride
Form Hard Capsules or Tablets
Pharmacological class Centrally Acting Skeletal Muscle Relaxant
Common use Relief of acute muscle spasms
Origin Synthetic compound

What Type of Medicine is Yurelax?

Yurelax is a prescription medication whose core medicinal component is the synthetic compound Cyclobenzaprine Hydrochloride. It is strictly classified as a centrally acting skeletal muscle relaxant, a category of drugs that specifically addresses muscle hypertonia, or excessive stiffness, by primarily acting on the central nervous system rather than directly on the muscle tissue. This effect is clinically recognized for its efficacy in musculoskeletal pain relief. The substance is structurally related to the tricyclic family of compounds, but its distinct pharmacological profile is dedicated to modulating muscle tone and tension.


The classification as a centrally acting muscle relaxant signifies that its effects originate in the central nervous system, influencing the nerve centers in the brain stem and spinal cord. It is defined as a single-ingredient product, containing only Cyclobenzaprine Hydrochloride as the active substance. The drug is typically positioned for short-term use in acute, painful conditions—for instance, temporary relief following a strain leading to localized muscle tightness. It is used in the management of muscle spasms associated with acute, painful musculoskeletal conditions.


Composition, Form, and General Purpose

The medication is formulated for oral administration, typically available as a solid pharmaceutical preparation, such as hard capsules or tablets. Cyclobenzaprine Hydrochloride serves as the sole active ingredient, a synthetic chemical entity responsible for the drug's therapeutic effect on the musculoskeletal system. Its availability as a single-ingredient, immediate-release (IR) formulation is a key characteristic.


The general purpose of this medicine is to help relieve the intense, localized stiffness and pain associated with acute musculoskeletal conditions. It achieves this through a high-level mechanism principle involving the dampening of overactive nerve signals originating from the central nervous system. This central signal dampening decreases the excitability of the motor system, thereby facilitating the relaxation of the spastic muscle and allowing for a potential return to a more natural state of mobility.

What side effects are possible with Yurelax?

Possible Side Effects and Safety Information

The safety profile of Cyclobenzaprine Hydrochloride (Yurelax) is documented across several categories, primarily reflecting its effects on the central nervous system (CNS) and its anticholinergic properties. These classifications establish the risks based on official government regulatory data.


Common Adverse Reactions and Organ Systems

Official labeling defines the most common adverse reactions as those with an incidence greater than 3% in clinical studies. These effects are often related to CNS depression and anticholinergic action, and typically manifest during the first month of treatment.

System-Organ Class Common Adverse Reactions
Nervous System Somnolence (drowsiness), Dizziness, Fatigue
Gastrointestinal Dry mouth, Constipation, Nausea, Dyspepsia

Serious Safety Considerations and Restrictions

The regulatory safety profile highlights significant, high-risk scenarios and explicit restrictions for use:

  • Serious Adverse Reactions: The labeling documents potential risks including Serotonin Syndrome when used with other serotonergic agents, as well as adverse cardiovascular effects (e.g., arrhythmias) due to the drug’s structural relation to tricyclic compounds.
  • Vulnerable Population Restrictions: Use is not recommended in older adults due to increased risk of adverse events. It is also not recommended in patients with moderate to severe hepatic impairment.
  • Contraindications: Cyclobenzaprine is explicitly prohibited for use in patients with certain pre-existing conditions, including congestive heart failure, specific cardiac conduction disturbances, hyperthyroidism, and concurrently with Monoamine Oxidase Inhibitors (MAOIs).

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Cyclobenzaprine Hydrochloride defines specific, severe manifestations that require immediate medical intervention. Overdose can result in signs of severe Central Nervous System (CNS) toxicity, including profound drowsiness, confusion, agitation, hallucinations, slurred speech, and potentially progressing to seizures or coma. Anticholinergic signs, such as mydriasis (dilated pupils), are also documented.

Life-threatening outcomes are documented, focusing heavily on cardiovascular toxicity. These include tachycardia (rapid heartbeat), severe hypotension (low blood pressure), the risk of severe arrhythmias, and ultimately cardiac arrest. Furthermore, regulatory information explicitly lists the potential for a severe reaction known as Serotonin Syndrome or an NMS-like presentation.

Mandated Emergency Action Documented Clinical Response
Seek emergency medical attention immediately for any suspected overdose. No specific antidote is known for this medication.
Immediate hospitalization is required for severe or life-threatening symptoms. Treatment is symptomatic and supportive, with gastrointestinal decontamination considered if ingested recently.
Continuous cardiac monitoring (ECG) is necessary. Elderly patients and those with pre-existing cardiovascular conditions are documented as being at increased risk of severe complications.

The official documentation emphasizes that management is supportive and requires strict clinical monitoring due to the absence of a specific reversal agent and the documented risk of immediate, serious cardiac and neurological events.

Therapeutic Uses of Yurelax

Yurelax is commonly used across conditions presenting with acute episodes characterized by muscle spasms and localized stiffness. It is relevant when supportive symptom management is appropriate and is applied in addressing conditions where functional stability becomes affected. It is commonly applied in addressing symptom clusters such as acute pain, rigidity, and limited movement that accompany musculoskeletal events.

This medication generally supports symptomatic relief by helping to manage symptoms related to physical discomfort that is linked to symptoms of increased neurological or muscular activity. It is relevant in conditions where symptoms may intensify temporarily, contributing to easing the overall symptom load and contributes to improved comfort during periods of heightened symptoms. The drug may help patients cope more steadily with difficult symptomatic phases, assisting with stability when symptoms are more noticeable.


Quick Fact: Relief for Acute Muscle Spasms

Benefit Focus Typical Context Patient Goal
Symptom Relief Applied when appropriate Easing discomfort
Symptom Type Acute Spasms Assisting with stability
Duration Temporary Episodes Supporting symptomatic phases

Eligibility and Restrictions for Use

Yurelax (Cyclobenzaprine Hydrochloride) eligibility is strictly defined by regulatory documents, distinguishing between absolute prohibitions and populations requiring conditional use.

Absolute Contraindications (Must Not Use)

Patients are ineligible if they have a known hypersensitivity to the drug or are taking Monoamine Oxidase (MAO) inhibitors or have discontinued one within the past 14 days. Absolute prohibitions also apply to patients with Hyperthyroidism or certain serious cardiovascular conditions, including recent myocardial infarction, arrhythmias, heart block, or Congestive Heart Failure (CHF).


Age and Conditional Restrictions

Use is established for adults and adolescents 15 years of age and older. Safety and effectiveness have not been established in children younger than 15. For older adults (65 and over), use requires caution and is not recommended for the extended-release form. Eligibility is further limited by organ function; use is not recommended in patients with moderate or severe hepatic impairment. Additionally, use is restricted to a short-term duration (up to 2–3 weeks) only. Conditional use is required for patients with certain pre-existing conditions like angle-closure glaucoma or a history of urinary retention.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official profile for Cyclobenzaprine (Yurelax) documents several critical interaction patterns established by regulatory authorities.

Contraindicated Combinations and Timing Rules

Co-administration with Monoamine Oxidase Inhibitors (MAOIs) is strictly contraindicated due to the risk of serious adverse reactions, including hyperpyretic crisis and seizures. A mandatory 14-day timing separation is required, meaning the drug must not be administered within 14 days of MAOI discontinuation.

Pharmacodynamic and Exposure Interactions

The combination of Cyclobenzaprine with other serotonergic drugs (e.g., SSRIs, SNRIs) may lead to an increased risk of Serotonin Syndrome, a potentially serious additive effect. The effects of CNS Depressants and Alcohol are formally noted as enhanced when co-administered. Additionally, the antihypertensive effect of Guanethidine may be blocked. The drug is primarily cleared via the liver enzymes CYP3A4 and CYP1A2; concomitant use with strong inhibitors of these enzymes is predicted to increase plasma exposure.

Population and Food Context

A high-fat meal is documented to increase the peak plasma concentration ( C max) and overall exposure ( AUC) of the extended-release formulation. Official labeling notes that drug exposure is substantially increased in the elderly population and approximately doubled in patients with hepatic impairment. Consequently, use is officially not recommended in these specific populations due to the heightened exposure risk.

Mechanism of Action

Targeting the Central Motor Control Pathway

The core mechanism of Yurelax involves acting as an antagonist at the central Serotonin Receptor Type 2A (5-HT2A), primarily within the brainstem. By blocking this receptor, the drug dampens the activity of the descending serotonergic pathways that provide excitatory input to motor neurons in the spinal cord. This molecular step initiates a cascade that leads to a reduction in the overactive signaling that modulates tonic somatic motor activity.


Reducing Motor Neuron Excitability

The downstream consequence of 5-HT2A antagonism is a decreased excitability of the alpha (alpha) and gamma (gamma) motor neurons within the spinal cord. This functional suppression reduces the efferent outflow—the signal traveling from the central nervous system to the muscle—thereby leading to a functional reduction in the muscle's hypertonic state and diminished tonic somatic motor activity. The drug is classified as centrally acting because it modulates the neural signal rather than acting directly on the peripheral muscle tissue itself.


Secondary System Modulation

Yurelax also engages in antagonism at other central targets, specifically the Histamine H1 receptors and certain Muscarinic Acetylcholine receptors. These non-specific molecular interactions contribute to secondary physiological effects, such as general central nervous system depression and anticholinergic activity, which collectively contribute to the overall central nervous system effects of the compound.

Dosage and Administration Information

How to Use Yurelax

Cyclobenzaprine Hydrochloride (Yurelax) is administered exclusively via the oral route, with specific dosing protocols detailed for its Immediate-Release (IR) tablets and Extended-Release (ER) capsules. The medication is used only for short-term periods, which should not exceed two or three weeks.


Standard Adult Dosing and Frequency

Formulation Starting Dose Maximum Daily Dose Frequency
IR Tablets 5 mg three times a day (TID) 60 mg TID (three times daily)
ER Capsules 15 mg once daily 30 mg Once daily

For IR tablets, the dose may be increased to 10 mg three times daily, depending on the required regimen. The ER capsule is designed for once-daily intake, ideally around the same time each day. The medication can be taken with or without food.


Specific Administration Guidelines

Specific instructions exist for how the medication must be handled. IR tablets must be swallowed whole and should not be crushed or chewed. Similarly, ER capsules must be swallowed intact, though the capsule contents may be sprinkled onto a tablespoon of applesauce and swallowed immediately without chewing.

If a dose is missed, it is generally advised to skip that dose if the time is near for the next scheduled dose, and double doses must not be taken.

Population-Specific Adjustments

Dose modification is generally required for certain patient groups. For older adults, therapy with the IR tablet should be initiated at the lower 5 mg dose with slow upward adjustment. The ER capsule is not recommended for use in this population or for patients with any degree of hepatic impairment.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Yurelax

Research Evidence for Acute Muscle Spasm

The active ingredient in Yurelax, cyclobenzaprine, was studied in short-term Randomized Controlled Trials (RCTs). These studies compare patterns observed in groups receiving the medicine against groups receiving an inactive substance (placebo). This body of research was evaluated in studies exploring how symptoms change over time in patients with acute, painful musculoskeletal conditions characterized by muscle spasm, such as low back or neck pain.

Studies examined how participants reported their pain intensity and muscle tightness, often using patient-reported outcomes describing perceived discomfort. Findings from these trials describe patterns observed over the short follow-up periods. For example, some trials reported a difference in measured symptom severity between the active medicine group and the placebo group. The evidence describes symptom patterns during the acute phase of these conditions.


Research on Treatment Duration and Long-Term Use

The majority of the pivotal research conducted on Yurelax was evaluated in settings focusing on short-term symptom changes. The follow-up durations for most key randomized controlled trials were limited, typically ranging from seven to fourteen days, which is relevant in trials assessing short-term or episodic symptom patterns.

Because the research focuses on acute episodes, the evidence base for long-term effects is not fully established. There is limited information for long-term outcomes regarding this medicine. The available evidence is specific to this short window, and data related to continuous use beyond two or three weeks remains limited.


Research Gaps and Areas of Uncertainty

While the core short-term evidence base has been studied for the acute indication, evidence quality varies across studies, with some older trials having been cited in scientific reviews for methodological limitations like inconsistent blinding.

One key gap is that comparative evidence is lacking in large, dedicated head-to-head trials against all other pain relief options. Furthermore, the limited follow-up durations mean research provides no evidence regarding outcomes related to systemic or functional imbalance over many months. Findings describe group patterns, but research does not determine whether an individual will respond similarly.

Frequently Asked Questions (FAQ)

Common questions about Yurelax (FAQ)

Q: How quickly does Yurelax typically start to work?

A: Official pharmacological documents describe the timing of Yurelax in the body. The immediate-release formulation typically reaches its highest concentration in the bloodstream approximately 3 to 4 hours after being taken. The extended-release capsule is designed to release the medicine slowly, meaning it takes longer to reach its peak concentration.


Q: Are there generic versions of Yurelax available?

A: The active ingredient in Yurelax, called cyclobenzaprine, is available in non-proprietary forms. This active ingredient can be found in generic formulations, including immediate-release tablets and extended-release capsules.


Q: Can Yurelax be used long-term?

A: Regulatory documents indicate that this medicine should only be used for short periods. Official labeling generally suggests a duration of up to two or three weeks because sufficient evidence for its effectiveness and safety during longer periods of use has not been established.


Q: Can Yurelax cause changes in mood or sleep patterns?

A: Official documentation reports that the drug can affect the central nervous system. The most common effect is somnolence (drowsiness). Less commonly, the drug has been linked to psychiatric effects like insomnia (difficulty sleeping), anxiety, agitation, and depressed mood.


Q: Are there any specific foods or drinks to avoid while taking Yurelax?

A: Official labeling describes that Yurelax may enhance the effects of alcohol, which can lead to increased central nervous system depression. Consumption of alcoholic beverages is described as requiring caution. Additionally, official labeling notes that taking the extended-release capsule with a high-fat meal can increase the amount of medicine absorbed by the body.


Q: Is Yurelax recommended for use in elderly patients?

A: Use of the extended-release capsule is not recommended for individuals 65 years of age or older. For the immediate-release tablet, official guidelines indicate that therapy should be initiated at a lower dose, and upward adjustments should be done slowly due to the recognized increased risk of adverse events in this population.


Q: Are there any known interactions between Yurelax and over-the-counter pain relievers?

A: Specific warnings for common OTC pain relievers (like ibuprofen or acetaminophen) are not always detailed in official labeling. However, official warnings about CNS depression and anticholinergic activity apply to co-administered medicines that share these effects, which may include certain OTC products.


Q: Can people with liver or kidney issues use Yurelax?

A: Official labeling states that Yurelax is not recommended for use in people with moderate to severe hepatic (liver) impairment due to substantially increased drug exposure. Official documents do not typically specify dosage adjustments or restrictions solely for patients with isolated renal (kidney) issues.


Q: Is Yurelax a controlled substance?

A: No, Yurelax, whose active ingredient is cyclobenzaprine, is not classified as a controlled substance. This means it is not categorized as having an abuse or dependency risk under the U.S. Controlled Substances Act.


Q: Is there a risk of dependency or withdrawal associated with Yurelax?

A: The drug is not classified as a controlled substance, which means it is not associated with abuse or dependency risk under the U.S. Controlled Substances Act. However, official postmarketing reports have noted that if the medicine is abruptly stopped after long periods of use, symptoms like nausea, headache, and general malaise may occur. This pattern is sometimes noted with medicines that have a similar chemical structure.


Q: Does Yurelax have a known effect on blood pressure?

A: Official postmarketing reports have included instances of changes in blood pressure. Both hypotension (low blood pressure) and hypertension (high blood pressure) have been documented in the drug's safety profile.


Q: Is Yurelax safe to take with common vitamins or supplements?

A: Regulatory documents do not generally list direct interactions with common vitamins. The officially noted risk of Serotonin Syndrome applies when combining Yurelax with other agents that raise serotonin levels. Specific herbal supplements that modulate serotonin, such as St. John's wort, are often noted in patient labeling as potential sources of this interaction risk.


Q: Are headaches a common side effect of Yurelax?

A: Headache is not listed among the most common adverse reactions (those occurring in more than 3% of patients) from official controlled studies. Nevertheless, headaches have been reported in the postmarketing surveillance data collected after the drug was made available to the public.


Q: Does the time of day matter when taking Yurelax?

A: Official instructions for the extended-release capsule recommend taking it once daily and around the same time each day to help maintain consistent levels of the drug in the body. The immediate-release tablet is simply prescribed for three times a day use.


Q: Is Yurelax used for conditions other than muscle spasms?

A: The only official, FDA-approved indication for Yurelax is for the relief of muscle spasm associated with acute, painful musculoskeletal conditions.


Q: What should I do if a side effect of Yurelax seems severe?

A: Official patient information typically states that if signs of a serious reaction occur, such as severe rash, swelling of the face, or significant difficulty breathing or swallowing, it is important to seek immediate emergency services.


Q: What evidence supports the use of Yurelax for muscle problems?

A: The drug's use is supported by official findings from short-term, randomized, controlled clinical trials. In these studies, patterns of symptom relief were observed when comparing patients taking Yurelax to those taking an inactive substance (placebo) for acute muscle spasm.


Q: Can I take Yurelax if I have a history of heart problems?

A: Official regulatory documents list several serious heart conditions as absolute contraindications (prohibitions) for use. These include recent myocardial infarction (heart attack), certain arrhythmias, heart block, or Congestive Heart Failure.


Q: Can I drive or operate machinery while taking Yurelax?

A: Official warnings state that Yurelax may impair the mental and/or physical abilities necessary for performing hazardous tasks. Activities such as operating heavy machinery or driving a motor vehicle may be affected because of the common side effects of drowsiness and dizziness.


Q: Is Yurelax ever prescribed for chronic pain conditions?

A: The official indication and duration limits the use of Yurelax to the treatment of acute muscle spasm associated with musculoskeletal conditions. Therefore, the treatment period is officially limited to the acute phase of two or three weeks.


Q: Is a metallic taste in the mouth a possible side effect of Yurelax?

A: While not among the most frequently reported side effects, official postmarketing reports have included instances of altered taste perception, known as ageusia (loss of taste) and reporting an unpleasant taste.


Q: Are there known interactions between Yurelax and common herbal supplements?

A: The officially noted risk of Serotonin Syndrome applies when combining Yurelax with other agents that raise serotonin levels. Specific herbal supplements that modulate serotonin, such as St. John's wort, are often noted in patient labeling as potential sources of this interaction risk.


Q: Why do some people stop taking Yurelax early?

A: Analysis of official clinical trial data indicates that the most common reasons for participants discontinuing the study drug were due to the central nervous system effects. Specifically, drowsiness and dry mouth were the primary reasons for discontinuation.


Q: Can Yurelax cause difficulty with urination?

A: Yes, official warnings mention that Yurelax may precipitate urinary retention (difficulty or inability to urinate). This risk is particularly noted in patients who have a pre-existing history of this condition.


Q: What is the safety profile of Yurelax for pregnant or breastfeeding women?

A: For pregnancy, the drug is officially categorized as Category B. For breastfeeding, it is not known whether the drug is excreted into human milk. The use of this medicine while breastfeeding is described as requiring caution.


Q: What is the difference between Yurelax and other common similar medications?

A: Yurelax is officially classified as a centrally acting skeletal muscle relaxant and works primarily in the central nervous system to dampen nerve signals. This mechanism is distinct from common pain relievers or other drugs that act directly on the muscle tissue itself.

How should Yurelax be stored and disposed of?

How to Store and Dispose of Yurelax?

The storage and disposal instructions for Yurelax (Cyclobenzaprine) are strictly defined by regulatory requirements to ensure product stability and safety.

Storage Requirements

Yurelax must be stored at Controlled Room Temperature (CRT), specifically between 20 mathrmC and 25 mathrmC (68 mathrmF and 77 mathrmF). Temperature excursions are permitted between 15 mathrmC and 30 mathrmC. The medication must be kept in a tightly closed container and stored out of the reach of children.

Disposal Instructions

Unused or expired Yurelax should be managed through a drug take-back program when available. If a program is not accessible, the medication must not be flushed down the toilet or sink, as it is not on the regulatory flush list. For household trash disposal, mix the tablets with an unappealing substance, seal the mixture in a container, and discard it in the trash.

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

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