Etifoxine

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Etifoxine

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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 Etifoxine

Quick Facts

Property Description
Active ingredient Etifoxine hydrochloride
Form Hard capsules
Pharmacological class Non-benzodiazepine anxiolytic (Psycholeptic)
Common use Relief of anxiety disorders
Origin Synthetic compound

Etifoxine: Overview, Identity, and Pharmacological Class

Etifoxine is a synthetic therapeutic compound classified as a non-benzodiazepine anxiolytic, used to help manage symptoms associated with anxiety disorders. The medicine is a psycholeptic belonging to the unique benzoxazine class, with its official classification being N05BX03 (Other anxiolytics). Its active ingredient is Etifoxine hydrochloride, which is prepared for oral administration as a single-ingredient product.

This designation as a non-benzodiazepine entity is critical, as it signifies a distinct pharmacological profile compared to traditional benzodiazepines. Clinical data indicates its efficacy as an anxiolytic agent, demonstrating improvements in anxiety symptoms. Research indicates that the medicine is clinically recognized for helping reduce feelings of anxiety and tension, such as those related to adjustment disorders.


Composition, Form, and General Purpose

Etifoxine is supplied for use in the form of hard capsules, formulated to contain the active compound, Etifoxine hydrochloride, along with necessary solid pharmaceutical excipients. The general purpose of this medication is to help stabilize the nervous system by modulating key chemical signals in the brain, which contributes to the relief of general anxiety and tension.

The compound achieves this effect through a dual mechanism of action: it enhances the primary calming system of the brain by acting on the GABAA receptor, while simultaneously stimulating the synthesis of natural anti-anxiety agents called neurosteroids. This combined approach supports the brain's intrinsic capacity to regulate mood and tension, providing a comprehensive general benefit for individuals experiencing anxiety disorders.

What side effects are possible with Etifoxine?

Possible Side Effects and Safety Information

The safety profile of Etifoxine, as documented in regulatory sources, categorizes potential effects by frequency and the body system affected. These classifications are based on formal regulatory data from post-marketing surveillance and clinical experience.


Adverse Reaction Classifications

Side effects are grouped by their estimated frequency according to official standards:

Classification Examples of Adverse Reactions (by official terminology)
Rare Slight drowsiness, benign skin reactions (e.g., maculo-papular rash, pruritus), allergic reactions (e.g., urticaria).
Very Rare Severe dermatological reactions (e.g., DRESS syndrome, Stevens-Johnson Syndrome), severe cytolytic hepatitis.
Not Known Anaphylactic shock, acute liver injury, lymphocytic colitis, metrorrhagia.

Organ Systems and Serious Reactions

Adverse effects have been reported across several System-Organ Classes (SOC), including Skin and subcutaneous tissue disorders, Immune system disorders, Hepatobiliary disorders (liver), and the Nervous system. The most serious documented reactions are Severe Cutaneous Reactions and Severe Cytolytic Hepatitis, both listed as Very Rare, and Anaphylactic Shock, which is listed as frequency Not Known.

Safety Considerations and Restrictions

Time-Related Patterns: Slight drowsiness is noted as an effect that may occur at the start of treatment and typically resolves spontaneously with continued use. The onset of severe skin reactions has been reported within the first month of treatment.

Special Populations and Contraindications: The medicine is officially contraindicated in individuals with severe liver impairment, severe kidney impairment, or conditions such as myasthenia gravis and circulatory shock. Additionally, it should not be used in patients with a history of previous severe dermatological or hepatic reactions to the drug. Monitoring of liver function may be considered for patients with hepatic risk factors, including the elderly.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Etifoxine overdose focuses on the documented clinical manifestations and regulator-mandated emergency actions.

Overdose Scope Description (Regulatory Statement)
Documented Manifestations Clinical signs are characterized by Central Nervous System (CNS) depression. This includes symptoms of lethargy (drowsiness) and excessive sleepiness, which may progress to deep sleep.
Emergency Actions Individuals must seek immediate medical attention and proceed to the nearest medical facility following a suspected overdose. Hospital monitoring may be required for observation.
Required Urgent Care Immediate medical help is also required upon the appearance of specific severe adverse reactions, including Severe Dermatological Reactions (such as SJS or DRESS) or signs of Severe Cytolytic Hepatitis (liver damage).
Antidote & Treatment No specific antidote is known for Etifoxine overdose. Management is officially defined as symptomatic and supportive treatment.

Regulatory documents define the overdose event based on the observed manifestations of CNS depression, which explicitly requires immediate, professional medical care for assessment. The official instructions mandate seeking urgent medical attention not only for an acute overdose but also upon observing specific severe, potentially life-threatening reactions during treatment, such as severe skin or liver problems. Due to the lack of a known specific antidote, the documented procedural context for overdose management is strictly limited to supportive measures and observation.

Therapeutic Uses of Etifoxine

What Etifoxine Treats: Main Uses and Benefits


Managing Situational Anxiety and Adjustment Distress

Etifoxine is commonly used for the short-term symptomatic relief of anxiety disorders, particularly in the context of adjustment disorder where stress causes pronounced worry and distress. The medicine is considered relevant for managing anxiety during episodes when emotional symptoms, such as excessive worry and nervous excitability, become difficult to tolerate and interfere with daily stability. The medication provides support that helps ease the overall symptom burden, supporting general well-being during symptomatic phases.

Its primary therapeutic applications are associated with symptomatic relief in generalized anxiety states, adjustment disorders, and psychosomatic syndromes where anxiety contributes to physical symptoms. The medication is used in situations where symptoms cluster into patterns requiring supportive management.


Easing Physical (Somatic) Manifestations of Anxiety

This key therapeutic domain involves addressing the physical symptoms that result from high anxiety and stress. This is relevant in conditions characterized by periods of heightened physiological stress. This includes being relevant for easing tension that leads to muscle tightness, stress-induced headaches, and certain autonomic (involuntary) symptoms or functional discomfort. Used in situations where symptoms cluster into patterns requiring supportive management, the medication contributes to easing the overall symptom load and supports general well-being during symptomatic phases, and may assist with maintaining functional stability.


Quick Fact

Property Description
Relief for Emotional tension and somatic anxiety
Context Short-term use during periods of heightened distress
Main Benefit Eases overall symptom burden and supports comfort

Eligibility and Restrictions for Use

Who Can and Cannot Use Etifoxine? Official Eligibility

The eligibility for using Etifoxine is strictly defined by regulatory documents, focusing on patient age, pre-existing medical conditions, organ function, and history of hypersensitivity.

Contraindicated Populations (Must Not Use)

The medicine is contraindicated and must not be used by patients with:

  • Severe Organ Impairment: This includes severe kidney impairment and severe liver impairment.
  • Comorbidities: Patients diagnosed with myasthenia gravis, circulatory shock, severe respiratory failure, or galactosemia.
  • Prior Reactions: Individuals with a known allergy to etifoxine or a history of severe dermatological reactions (e.g., DRESS syndrome, SJS) or severe hepatitis during previous treatment.

Restricted and Non-Recommended Use

Category Regulatory Status
Age Group Use is limited to adult patients (18 years and older). Use in children and adolescents is not recommended (efficacy not established).
Reproductive Status Use is not recommended during pregnancy or breastfeeding (lactation).
Conditional Use Patients with risk factors for liver problems (e.g., older adults) require specific monitoring, including liver function tests.

These official rules strictly define the eligible population as documented in regulatory prescribing information.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section describes only the formally documented interaction patterns for Etifoxine hydrochloride as stated in official government regulatory documents.


Pharmacodynamic Interactions

The most significant and officially documented interaction pattern for Etifoxine is an additive pharmacodynamic effect when co-administered with other central nervous system (CNS) depressants. Co-administration results in an increased risk or severity of CNS depression, which can lead to heightened drowsiness and decreased alertness.

Category Officially Documented Interacting Substances
Medicinal Product Classes Benzodiazepines, Central Analgesics, Antipsychotics, Sedative Antihistamines
Drug-Substance Alcohol and alcohol-containing medicines

Interaction-Related Restrictions and Mechanisms

Due to the pharmacodynamic reinforcement, the use of alcohol is formally restricted during treatment with Etifoxine, as it is documented to increase the sedative effect. This restriction applies to both alcoholic beverages and medicines containing alcohol.

Official regulatory labels do not document clinically significant pharmacokinetic or metabolic interactions involving major enzyme systems like the Cytochrome P450 (CYP) pathway. Consequently, the labeling does not specify mandatory timing or separation requirements (e.g., 'must be separated by X hours') for co-administration with other medicines based on a metabolic interaction risk.

Mechanism of Action

How Etifoxine Works: Mechanism of Action


Direct Enhancement of GABA Inhibition

Etifoxine's action involves Positive Allosteric Modulation (PAM) on the GABA A receptor complex. It binds to a unique site, specifically on the beta subunits, distinct from the classical benzodiazepine binding motif. This interaction potentiates the function of the inhibitory neurotransmitter GABA, resulting in a reduction in neuronal excitability and a shift toward increased neuronal inhibition within the central nervous system (CNS).


Stimulation of Endogenous Neurosteroid Production

The second, complementary mechanism involves agonist activity on the Mitochondrial Translocator Protein (TSPO). This action accelerates the synthesis of the endogenous neurosteroid allopregnanolone, which further potentiates the GABA A receptor complex. This pathway increases the concentration of an endogenous modulator, thereby influencing the nervous system's inhibitory tone.


Dual Synergy and Physiological Modulation

The simultaneous operation of these two distinct mechanisms—direct receptor modulation and indirect neurosteroid stimulation—results in a synergistic effect. Both pathways converge to reinforce and sustain the overall inhibitory tone, which contributes to the modulation of central nervous system activity.

Dosage and Administration Information

Etifoxine is supplied as 50 mg hard capsules and is designated for oral administration as the official route of use. The standard method of administration requires the capsule to be swallowed whole using a small amount of water.


Official Dosing and Schedule

Dosage is determined by a healthcare provider, but the typically prescribed total daily amount ranges from 150 mg to 200 mg of Etifoxine hydrochloride. This total is generally distributed across the day into two or three divided doses, with each individual dose being either 50 mg or 100 mg. Official instructions specify that the simultaneous ingestion of alcoholic beverages must be avoided during the course of use.


Duration and Special Use Constraints

Treatment with Etifoxine is intended for short-term symptomatic relief. The use protocol establishes a high-level limit, stating that the duration of treatment must not exceed 12 weeks.

Regarding specific patient populations, the official label explicitly states that the safety and effectiveness of the medicine have not been established for the pediatric population (children and adolescents under 15 years of age). In the event that a dose is missed, it is formally stated that the subsequent dose must not be increased or doubled to compensate for the omission.

Recent Clinical Evidence

Research evidence / Overview of studies for Etifoxine


Evidence for Use in Anxiety Disorders and Adjustment Distress

The core research on Etifoxine was studied for its use in managing symptoms of anxiety disorders, particularly those associated with adjustment distress. The evidence relies on randomized controlled trials (RCTs) and comparative studies designed to monitor how symptoms change over defined time intervals. Studies included adult outpatients whose conditions were associated with fluctuating manifestations of anxiety. Research examined how the outcomes compared to those in groups receiving a placebo or groups receiving other established anxiolytic medicines, such as specific benzodiazepines. Reported findings describe patterns observed in the study measurements collected from these different groups.


Research Outcomes Studied in Clinical Trials

Researchers tracked several key areas. Studies primarily monitored outcomes related to physical discomfort and outcomes linked to physiological strain. They also evaluated outcomes reflecting daily functioning or activity level, assessing how anxiety may influence everyday life. These outcomes were measured using standardized tools. For example, the Hamilton Anxiety Rating Scale (HAM-A) was used in research exploring how symptoms change over time, while the Clinical Global Impressions-Change Scale (CGI-C) provided an overall assessment. These tools allowed researchers to collect patient-reported outcomes describing perceived discomfort.


Long-Term Studies and What Is Still Uncertain

The majority of trials focused on short-term symptom patterns over periods of 4 to 12 weeks, indicating that follow-up durations were limited. The long-term effects are not fully established. The scientific literature highlights areas where more research is needed, confirming that certainty remains low in some aspects. A key limitation is that the evidence is limited to short-term outcomes in specific anxiety conditions. Furthermore, a specific regulatory study reported measured changes that were similar to those observed in the placebo group, which underscores that findings were mixed in certain high-quality trials. The existing evidence still needs additional long-term follow-up work to fill the gaps in knowledge.

Key Studies & References

  1. Etifoxine versus alprazolam for the treatment of adjustment disorder with anxiety: a randomized controlled trial (The ETIZAL Study)
  2. Etifoxine impairs neither alertness nor cognitive functions of the elderly: A randomized, double-blind, placebo-controlled crossover study (NCT02147548 / Deplanque et al., 2018)

Frequently Asked Questions (FAQ)

Common questions about Etifoxine (FAQ)


Q: How quickly does Etifoxine start working for anxiety?

Evidence from clinical literature suggests that the anxiolytic effects of Etifoxine are described as potentially appearing within days of beginning treatment. Initial changes in anxiety symptoms were often noted by researchers in studies conducted during the first week of continuous use. It is important to note that the medicine is intended for short-term symptomatic relief.


Q: Can Etifoxine be taken long-term?

No, official regulatory guidelines describe treatment with Etifoxine as intended for short-term symptomatic relief. Regulatory documents explicitly define the authorized protocol, stating that the duration of treatment is generally not to exceed 12 weeks, due to limited safety and efficacy data for longer-term use.


Q: Is Etifoxine addictive or habit-forming?

Official information indicates that Etifoxine is not classified as a controlled substance in many regions where it is sold. Clinical trials and safety reviews suggest it has a low potential for dependence, tolerance, or withdrawal syndromes when compared to traditional benzodiazepine anxiolytics.


Q: Can Etifoxine cause withdrawal symptoms?

Regulatory data, which includes reviews of anxiety rebound after stopping treatment, suggests that Etifoxine is not typically associated with withdrawal syndromes upon cessation. This pattern is noted as different from some other types of anxiolytic medications.


Q: Is it safe to drive while taking Etifoxine?

Official product information contains a caution regarding the potential for slight drowsiness, especially when treatment is first started. This could potentially impair the ability to drive or operate machinery. The official warnings advise against driving until the individual is certain the medicine does not impair their judgment or reaction time.


Q: Can Etifoxine affect my sleep?

The most common nervous system-related effect reported is slight drowsiness, which tends to occur at the start of treatment and usually resolves over time. Effects on sleep quality itself are not the primary focus of documented adverse events in official summaries.


Q: Is Etifoxine safe for older adults?

While the medicine is indicated for adults, official information notes that patients with risk factors for liver problems, including the elderly, may require specific monitoring, such as liver function tests. One clinical study suggests a single dose does not impair alertness in healthy elderly volunteers compared to placebo.


Q: Can Etifoxine cause problems with memory or concentration?

Regulatory summaries and clinical literature suggest that Etifoxine is associated with minimal adverse effects on cognitive functions, such as memory or concentration. This indicates a different profile compared to some traditional anxiolytics.


Q: Can Etifoxine be taken with common pain relievers like ibuprofen?

Official regulatory documents do not list non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen as having a formal interaction. The product label primarily documents additive effects with other CNS depressants, but notes the absence of documented clinically significant metabolic interactions that often affect other medications.


Q: Are there any food restrictions while taking Etifoxine?

Official administration instructions specify that the ingestion of alcoholic beverages must be avoided during the course of use. Regulatory documents do not specify any restrictions related to non-alcoholic foods or general diet.


Q: Where does Etifoxine come from—is it a natural substance?

Etifoxine is a synthetic compound, meaning it is manufactured chemically, rather than derived directly from a natural source. It belongs to the unique benzoxazine chemical class of medicines.


Q: Why is Etifoxine not available in the United States?

Etifoxine is not currently approved for marketing or public distribution by the U.S. Food and Drug Administration (FDA). It is approved and available in many other countries but does not appear on the FDA's list of approved drug products for commercial use.


Q: Is Etifoxine similar to buspirone (Buspar)?

Both Etifoxine and buspirone are classified as non-benzodiazepine anxiolytics, meaning their mechanism differs from traditional benzodiazepines. A clinical study comparing the two indicated that Etifoxine showed a more rapid onset of effect in reducing anxiety symptoms than buspirone.


Q: Can Etifoxine cause any skin reactions or allergies?

Yes, regulatory documents report various skin and subcutaneous disorders, with rare occurrences of maculo-papular rash or pruritus. Very rare and serious reactions, such as DRESS syndrome and Stevens-Johnson Syndrome, have also been officially documented.


Q: What are the signs of an allergic reaction to Etifoxine?

Official documentation contains an instruction that urgent medical attention should be sought if an individual experiences severe skin or allergic reactions. Specific severe symptoms that may indicate liver issues include jaundice (yellowing of the skin), vomiting, tiredness, and abdominal pain.


Q: Is Etifoxine known to interact with birth control pills?

Official regulatory labels do not document a specific clinically significant interaction with oral contraceptives. The labeling explicitly notes the absence of documented interactions with the major enzyme systems (CYP pathway) that are often involved in such interactions.


Q: Does Etifoxine interact with herbal supplements like St. John's Wort?

Official regulatory labeling does not list St. John's Wort as a documented interacting substance. The document states that clinically significant pharmacokinetic or metabolic interactions are not specified in the product information.


Q: Is there a risk of overdose with Etifoxine?

Regulatory documents mention that symptoms of overdose are generally documented as lethargy and excessive sleepiness. In the event of suspected overdose, official medical guidance should be sought immediately, as is standard practice for all medications.


Q: Can Etifoxine be crushed or split?

Etifoxine is supplied as a hard capsule, and the authorized protocol specifies that the capsule must be swallowed whole with a small amount of water for oral administration. Instructions for altering the capsules by crushing or splitting are not provided in the product information.


Q: Does Etifoxine cause a 'high' or euphoric feeling?

Clinical research and regulatory profiles classify Etifoxine as an anxiolytic used for anxiety management. The official documentation does not describe the experience of a 'high' or euphoric feeling as a noted adverse event or desired effect.


Q: Does Etifoxine have any known long-term side effects that appear after years of use?

The majority of clinical trials focused on short-term outcomes over periods of 4 to 12 weeks. Official product information specifies that the authorized treatment duration is generally not to exceed 12 weeks, indicating that long-term effects are not fully established based on the existing evidence.


Q: Does Etifoxine interact with blood thinners?

Official regulatory labels do not document a specific clinically significant interaction with blood thinners. The label notes the absence of documented interactions with the major enzyme systems (CYP pathway) that are often involved in such interactions.

How should Etifoxine be stored and disposed of?

How to Store and Dispose of Etifoxine

Etifoxine hard capsules must be stored according to regulatory requirements to ensure product stability and safety.

Storage Conditions

  • Store the medicine at a temperature at or below 25 C and do not store above 30 C.
  • The capsules must be kept in the original packaging and protected from light and moisture.
  • The product has a labeled shelf life of approximately 36 months when stored correctly.
  • It is mandatory to store the medicine out of the sight and reach of children.

Disposal Instructions

Unused or expired Etifoxine, as well as any waste material, must be disposed of in accordance with local requirements. There are no special handling requirements beyond following the authorized local waste management procedures for medicinal products.

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

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