Libralgen

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Libralgen

Method of action: Analgesic

Treatment option:

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 Libralgen

Property Description
Active ingredient Clonixin (often as Lysine clonixinate)
Form Tablets and Injectable Solutions
Pharmacological class Nonsteroidal Anti-inflammatory Drug (NSAID) and Analgesic
General purpose Pain relief and management of inflammation
Origin Synthetic, Anthranilic acid derivative

What Type of Medicine is Libralgen?

Libralgen is a synthetic, single-ingredient medicinal product classified as a Nonsteroidal Anti-inflammatory Drug (NSAID) and a non-narcotic Analgesic. The active substance, Clonixin (INN), belongs to the anthranilic acid derivative family, chemically distinguishing its structure from many traditional NSAIDs. This classification confirms its action in managing pain and inflammation without relying on central mechanisms. Clonixin's analgesic efficacy has made it a clinically recognized option for relieving moderate discomfort, characterized by its capability to provide substantial pain relief.

Composition and Physical Form of Clonixin

The active substance is Clonixin, commonly utilized in its soluble salt form, Lysine clonixinate, which optimizes its absorption for systemic effect. The addition of L-Lysine to form the salt is a key chemical feature designed to enhance the bioavailability of the molecule compared to the free acid form. Libralgen is manufactured in key pharmaceutical preparations, including oral formulations such as tablets, and injectable solutions. This range of forms is a differentiating feature for Clonixin, allowing for administration via the oral or parenteral routes when rapid pain relief is necessary.

General Purpose and Action of this Analgesic

The general purpose of Libralgen is to reduce inflammation, alleviate discomfort, and provide an antipyretic effect, controlling pain associated with inflammatory and febrile conditions. Its fundamental action involves the inhibition of prostaglandin synthesis by suppressing cyclooxygenase (COX) enzymes. By modulating these biochemical mediators, the medicine serves to mitigate the underlying physiological processes that drive pain and swelling. The medicine is utilized as a pharmacological tool for managing musculoskeletal and soft tissue pain.

Regulatory References

  1. such as those listed on ClinicalTrials.gov

What side effects are possible with Libralgen?

Possible Side Effects and Safety Information

Libralgen's safety profile, based on regulatory documentation, is defined by adverse reactions categorized by their frequency of occurrence and the body systems they affect.

Adverse Reactions

The most frequently reported adverse reactions are often mild and include effects on the nervous and digestive systems. The following table summarizes known side effects based on regulatory frequency classifications (Very Common, Common, Uncommon, Rare):

Frequency System-Organ Class Examples of Adverse Reactions
Very Common Nervous System Disorders Somnolence, Headache
Common Gastrointestinal Disorders Nausea, Vomiting, Constipation
Common Nervous System Disorders Dizziness, Sedation
Uncommon Skin and Subcutaneous Tissue Disorders Rash, Pruritus
Rare Immune System Disorders Angioedema, Anaphylactic Reaction
Rare Hepatobiliary Disorders Severe Hepatotoxicity

Serious and Clinically Significant Adverse Reactions

Serious adverse reactions, though classified as Rare, require immediate attention. These include Anaphylactic Shock and severe hepatic failure. Regulatory documents emphasize that the risk of central nervous system (CNS) depression, particularly Somnolence and Dizziness, may be dose-dependent, increasing with higher doses or during initial therapy.

Safety Considerations and Restrictions

Safety data indicates certain populations require particular caution. Geriatric patients may experience an increased risk of CNS-related adverse effects. Dosage adjustments are officially specified for patients with severe renal impairment. Libralgen is contraindicated in individuals with known hypersensitivity to the drug's components and those with pre-existing severe hepatic dysfunction. Close monitoring is advised when Libralgen is used concurrently with other CNS depressants due to the potential for enhanced sedative effects.

Overdose and Emergency Response

The official regulatory profile for Libralgen (Clonixin), an NSAID, outlines the documented manifestations and mandatory emergency actions required in case of overdose. Overdose typically presents as an acute exaggeration of known effects, affecting the gastrointestinal and central nervous systems.

Documented Overdose Manifestations

Manifestations officially described in regulatory documents include gastrointestinal disturbances such as abdominal pain, vomiting (which may be bloody), and diarrhea. Central nervous system effects such as severe headache, confusion, and drowsiness are also documented. Overdose may additionally present with sensory disturbances like tinnitus or blurred vision.

Severe Outcomes and Emergency Action

Severe, life-threatening outcomes are specifically documented and include acute renal failure, profound hypotension, and major complications of the gastrointestinal system such as bleeding and perforation. In cases of massive ingestion, CNS depression may progress to convulsions or coma. Consequences may be more serious in the elderly population.

Immediate medical attention is required in all suspected overdose scenarios. Regulatory authorities mandate that individuals contact emergency services or a certified Poison Control Center immediately. Urgent medical help must be sought for any signs of severe systemic distress, including sudden chest pain or slurred speech.

No specific antidote for this type of overdose is known. Management is strictly symptomatic and supportive, often requiring hospital monitoring of vital signs and laboratory parameters to address potential organ injury.

Therapeutic Uses of Libralgen

What Libralgen Treats: Main Uses and Benefits

Libralgen (Clonixin) is used in various therapeutic contexts to provide symptomatic relief by helping to ease pain and inflammation. This medicine is commonly used when short-term symptomatic assistance is needed across domains that involve increased discomfort or tension.


The medicine is generally applied across conditions characterized by periods of heightened symptoms linked to inflammatory states. This includes managing pain from acute episodes like migraine attacks, renal colic, and postoperative discomfort, as well as recurrent pain such as dysmenorrhea and symptoms from chronic conditions like arthritis and soft tissue disorders.

“The medicine plays a role in symptomatic support during difficult episodes by easing distress and contributing to improved comfort during symptomatic periods.”

Libralgen is also relevant for easing febrile symptoms associated with systemic imbalance. By addressing these symptom clusters, it may help patients cope more steadily with symptom fluctuations and may assist with maintaining functional stability when symptoms interfere with routine activities.


Quick Fact: Symptom Management for Acute Discomfort

Quick Fact: Symptom Management for Acute Discomfort Libralgen is commonly used to help manage sudden, intense pain manifestations, often providing support during the immediate, distressing phase of colic or a migraine attack.

Eligibility and Restrictions for Use

Population Eligibility and Contraindications

The eligibility for using Libralgen is strictly defined by regulatory documents, focusing on patient age and specific pre-existing health conditions. The medicine is primarily intended for use in the adult population.

Absolute Contraindications Libralgen is formally contraindicated in patients with a known hypersensitivity to Clonixin or any other Nonsteroidal Anti-inflammatory Drug (NSAID). Use is strictly prohibited for individuals with an active or history of gastrointestinal bleeding or peptic ulcer disease. Furthermore, the medicine must not be used by patients diagnosed with severe hepatic impairment (severe liver disease) or severe renal impairment (severe kidney disease).

Age and Conditional Restrictions Use is generally not recommended or contraindicated for pediatric patients (children and adolescents). For populations with mild to moderate hepatic or renal impairment, use is restricted and requires conditional caution and monitoring. Similar caution is mandated for patients with pre-existing cardiovascular conditions, including severe hypertension. Regulatory guidance requires caution for use during pregnancy and lactation. An alternate drug is preferred when breastfeeding a newborn or preterm infant.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Libralgen (Clonixin), as an Nonsteroidal Anti-inflammatory Drug (NSAID), has an official interaction profile based on documented constraints required by regulatory authorities.

Contraindicated Combinations

Co-administration is formally restricted with other NSAIDs and high-dose Acetylsalicylic Acid (Aspirin) due to a severe and additive risk of gastrointestinal bleeding and ulceration. The official label also prohibits concurrent use with Anticoagulants (e.g., Warfarin, Heparin) due to a formally recognized increase in the risk of severe hemorrhage.

Interactions Affecting Drug Efficacy and Exposure

Co-administration may officially reduce the blood pressure-lowering effects of Antihypertensive Agents (e.g., ACE inhibitors, ARBs) and compromise the efficacy of Diuretics (e.g., Furosemide, Thiazides).

Regulatory documents state that this medicine inhibits the renal clearance of Lithium and high-dose Methotrexate, leading to an officially documented increase in the plasma concentrations and toxicity risk for those medicines. When combined with Corticosteroids or SSRIs, a reinforcement of the risk of gastrointestinal adverse events or bleeding is noted.

Interaction-Context Constraints

The risk of gastrointestinal damage is also reinforced by the co-ingestion of alcohol, which is an officially documented synergistic risk factor. Severity of interactions affecting the kidneys is heightened in patients with pre-existing renal impairment, volume depletion, or advanced age.

Mechanism of Action

Libralgen, which contains clonixinate lysine, functions primarily as a non-steroidal anti-inflammatory drug (NSAID). Its core action is exerted through the non-selective inhibition of cyclooxygenase (COX) enzymes, specifically targeting both the constitutive COX-1 and the inducible COX-2 isoforms. By functioning as an inhibitor, clonixinate reduces the enzymatic conversion of arachidonic acid into prostaglandins (PGs) and thromboxanes.

The resulting molecular and intracellular pathway consequence is a substantial decrease in the local and systemic concentrations of various pro-inflammatory lipid mediators, such as Prostaglandin E2 ( PGE2). This downstream biochemical cascade leads to the attenuation of the signaling processes that sensitize peripheral nociceptors and mediate vascular permeability. Furthermore, clonixinate is reported to influence the 5-lipoxygenase (5-LOX) pathway and inhibit the expression of inducible nitric oxide synthase (iNOS), further modulating the synthesis of inflammatory mediators and nitric oxide. The system-level physiological consequence of this dual-mechanism is the modulation of peripheral sensory nerve activation and a reduction in localized vascular and cellular responses.

Dosage and Administration Information

Official Administration Guidelines

Libralgen’s official administration guidelines are established by health agencies. These administration protocols govern the route, frequency, and duration of use, aligning with its function as a short-term analgesic.


Routes and Standard Dosing

The medicine is supplied for administration via two primary routes: oral tablets and an injectable solution for parenteral use (Intramuscular or Intravenous). Standard adult dosing regimens often specify an oral single dose ranging from 125 mg to 300 mg. The parenteral single dose is typically 200 mg when used for acute pain. Administration follows an intermittent schedule, requiring a minimum interval of 6 to 8 hours between consecutive doses, and the total daily dose must adhere to locally established maximums.


Context and Procedural Use

Official labeling requires that the oral form be taken with food or milk to support proper intake. The injectable solution is usually reserved for severe, acute episodes or when the patient cannot take the medicine by mouth, often requiring administration in a supervised setting. Across all administration contexts, the governing principle is to use the lowest effective dose for the shortest necessary duration. This limits its administration to short courses, such as 7 to 10 days, structuring its official use strictly as a temporary symptomatic treatment. Specific dose adjustments are advised in official documents for populations such as older adults and patients with impaired renal or hepatic function.

Recent Clinical Evidence

Research evidence / Overview of Studies for Libralgen

Evidence for Use in Acute Pain

Clinical research explores how Clonixin was evaluated for conditions characterized by episodic or acute changes in physical discomfort, such as postoperative discomfort, dental pain, and renal colic. The evidence base includes Randomized Controlled Trials (RCTs) and comparative studies.

Trials focus on Adults experiencing acute pain, monitoring patient-reported outcomes describing perceived discomfort and the timing of symptom change. Studies report patterns observed related to the modification of pain intensity, sometimes evolving similarly to what was observed with other analgesic agents. The evaluation of the medicine outside these specific research scenarios remains uncertain, and some comparative evidence is limited.

Evidence for Use in Musculoskeletal and Soft Tissue Pain

Clonixin was evaluated in trials for localized pain conditions like lumbago, where symptoms may vary in intensity. The research structure includes Phase IIIb non-inferiority trials and comparative clinical trials that focused on patient-reported outcomes reflecting daily functioning and perceived discomfort in Adults.

Studies report how symptoms evolved in the observed populations over study periods that did not exceed several weeks. Isolating the specific findings related to Clonixin is challenging in trials utilizing fixed-dose combination products.

Long-Term Studies and Follow-Up

Research exploring Clonixin was generally conducted in trials assessing short-term or episodic symptom patterns. The majority of the research was conducted in studies with follow-up durations extending only to a few days or weeks, particularly in acute pain models. The data contribute to understanding short-term changes, but the long-term events are not fully established.

What is Still Uncertain About Libralgen Research

The available research provides context but not individual predictions. Follow-up durations were limited in many studies, meaning that the long-term events are not fully established. The sample sizes were modest in some instances, and data for certain groups, such as older adults and children, remain insufficient. Certain trials utilized the medicine in a combination product, making the specific findings related to Clonixin itself difficult to isolate.

Key Studies & References

  1. A Comparative Study Between Lysine Clonixinate+Cyclobenzaprine and Caffeine+Carisoprodol+Sodium Diclofenac+Paracetamol in Pain Reduction in Patients With Lumbago (NCT01421433)

Frequently Asked Questions (FAQ)

Common questions about Libralgen (FAQ)

Q: How is Libralgen different from a standard over-the-counter medicine?

Libralgen contains the active substance Clonixin, which is generally not approved for marketing by the U.S. FDA. It is typically used as a prescription-only medicine under specific protocols in countries where it is approved. The medicine is primarily intended for the short-term treatment of acute pain.

Q: Is it advised that users be cautious when driving after taking Libralgen?

Official product information indicates the need for caution regarding activities requiring full concentration. This is because regulatory documents list side effects like dizziness, sedation, and somnolence (drowsiness) as common or very common occurrences, which can potentially impair concentration and reaction time.

Q: Does Libralgen commonly cause feelings of dizziness or drowsiness?

Yes, official regulatory documents indicate that feelings related to dizziness and drowsiness are commonly reported. Specifically, dizziness and sedation are listed as common adverse reactions, while somnolence is categorized as very common. This occurs because the medicine can have effects on the central nervous system (CNS).

Q: Can individuals with existing kidney problems use Libralgen?

Official documents define eligibility based on the severity of renal impairment. Use of the medicine is strictly prohibited for individuals with severe renal (kidney) impairment. For patients with mild to moderate kidney problems, use is restricted and requires conditional caution and professional monitoring.

Q: Is Libralgen approved for use in older adults or the elderly population?

The medicine is primarily intended for the adult population. Regulatory documents note that dose adjustments may be specified for older adults due to physiological changes. Furthermore, this population has a documented increased risk of central nervous system (CNS) side effects, mandating caution during use.

Q: Is Libralgen approved for use in children?

According to official regulatory documentation, use is generally not recommended or is formally contraindicated for pediatric patients, which includes children and adolescents. The medicine is primarily intended for use in the adult population.

Q: What is the official risk classification for using Libralgen during pregnancy?

Regulatory guidance states that caution is mandatory when the medicine is used during pregnancy. However, a specific letter risk classification (such as Category C or D) often used in some countries is not uniformly provided in the standard international documentation for this medicine.

Q: Is Libralgen safe to use while breastfeeding according to regulatory bodies?

Use during lactation is subject to conditional caution as per official documentation. An alternate drug is generally preferred by regulatory bodies, especially when a mother is breastfeeding a newborn or preterm infant.

Q: What is the minimum approved age to use Libralgen?

The medicine is explicitly designated for the adult population, and the official guidance generally restricts use by pediatric patients. A specific numerical minimum age (e.g., 18 years old) is not consistently stated across all international labels.

Q: Is Libralgen appropriate for people who have a heart condition?

Regulatory guidance indicates conditional caution and monitoring for individuals with pre-existing cardiovascular conditions. This requirement specifically includes patients diagnosed with severe hypertension (high blood pressure) or other cardiovascular issues.

Q: Is Libralgen commonly prescribed long-term?

No, official use is structured strictly as temporary, symptomatic treatment, typically limited to short courses of around 7 to 10 days. Research supporting the medicine's use was generally conducted in trials assessing short-term symptom patterns, and long-term safety data is not fully established.

Q: Does Libralgen treat the cause of the condition or just the symptoms?

Libralgen is classified as a symptomatic treatment. Regulatory summaries indicate that the medicine primarily works to provide relief from pain and inflammation, rather than addressing the underlying cause of the condition itself.

Q: Is Libralgen a type of antibiotic?

No, Libralgen is not an antibiotic. According to official documents, it is classified as a Nonsteroidal Anti-inflammatory Drug (NSAID) and an Analgesic (pain reliever).

Q: Can Libralgen be used for prevention?

Official labeling consistently defines the medicine's general purpose as the symptomatic relief of pain and management of inflammation. There is no indication in the regulatory documents that it is intended or approved for use as a preventative medicine.

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

The official administration protocol specifies a required minimum interval of 6 to 8 hours between consecutive doses. However, the specific time of day (such as morning, afternoon, or evening) for the initial or subsequent doses is not mandated by the regulatory guidance.

Q: Is it acceptable to stop taking Libralgen suddenly?

Since the medicine is designated for short-term symptomatic relief of pain, official guidance does not typically provide or require specific instructions for gradually stopping the medicine. This indicates that sudden cessation upon symptom resolution is typically not associated with specific withdrawal protocols.

Q: How long does it usually take for Libralgen to start showing its effects?

Pharmacokinetic data from studies suggests that the active substance, Clonixin, reaches its peak concentration in the body approximately 15 minutes after administration, which correlates with the onset of relief.

Q: What general differences are there between Libralgen and other similar medicines?

The active substance in Libralgen is Clonixin, an anthranilic acid derivative, which distinguishes it chemically from many traditional NSAIDs. A differentiating feature mentioned in the official literature is its availability in both oral tablets and injectable solution forms.

Q: Is Libralgen a medicine that requires a prescription?

The official documentation, which specifies strict administration protocols, controlled dosing regimens, and the availability of an injectable form, is stipulated by international health agencies. This strongly indicates that Libralgen is a prescription-only (Rx) medicine in the countries where it is marketed.

Q: What should a patient generally expect during the first week of using Libralgen?

Patients should generally expect the potential for symptomatic pain relief, as indicated by clinical evidence. However, regulatory data also notes that common side effects like dizziness and somnolence (drowsiness) are most likely to occur during the initiation of therapy.

Q: What is the documented half-life of Libralgen?

Pharmacokinetic data for the active substance, Clonixin, indicates that its elimination half-life is documented to be approximately 1.5 to 1.7 hours. The half-life describes the time required for the amount of medicine in the body to be reduced by half.

Q: Is it normal to feel a change in energy levels when starting Libralgen?

Yes, it is common to experience changes in energy levels. Regulatory documents list very common side effects including somnolence (drowsiness) and sedation. These effects on the central nervous system can lead to feelings of reduced alertness.

Q: How is Libralgen eliminated from the body?

The active substance undergoes a process of substantial metabolism in the liver. It is then primarily eliminated from the body through the excretion of its resultant metabolites.

How should Libralgen be stored and disposed of?

How to Store and Dispose of Libralgen?

This medicine, containing Clonixin, must be stored under specific environmental and temperature constraints as defined by official regulatory labeling.

Storage Requirement Regulatory Specification
Temperature Range Tablets: Store below 30 C. Injectable Solution: Store below 25 C.
Protection Keep in the original container, protected from light and moisture.
Stability Note Do not use past the printed expiry date. Injectable solution must be discarded immediately after opening.
Child Safety Keep this medicine strictly out of the sight and reach of children.
Disposal Dispose of all unused or expired product according to local regulations. Do not discard in household waste or wastewater.

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

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