Sevofrane

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Sevofrane

Medically reviewed

Rosario Oropesa

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 Sevofrane

What is Sevofrane?

Sevofrane is a pharmaceutical preparation containing the active substance sevoflurane. It belongs to a class of medications known as inhalation anesthetics. These substances are administered in vapor form and are primarily used to induce and maintain a state of general anesthesia during surgical procedures.

Characteristics and Mechanism

Sevofrane is a clear, colorless liquid that evaporates easily. When inhaled through a specialized delivery system, it enters the bloodstream via the lungs and travels to the central nervous system. Its primary function is to cause a reversible loss of consciousness and sensation, allowing medical interventions to be performed without pain or awareness.

Key features of this agent include:

  • Rapid Onset: It acts quickly to produce unconsciousness.
  • Precise Control: The depth of anesthesia can be adjusted rapidly by changing the concentration of the vapor.
  • Fast Recovery: The substance is cleared quickly from the body through exhalation, allowing for a relatively prompt return to consciousness once administration ceases.

Clinical Application

In clinical settings, Sevofrane is utilized for both adult and pediatric populations. Because it has a non-pungent odor and does not irritate the airways as much as some other inhalation agents, it is frequently used for "mask induction," where a patient breathes the vapor to fall asleep before an intravenous line is established. This characteristic makes it a common choice in pediatric anesthesia.

What side effects are possible with Sevofrane?

Possible Side Effects and Safety Information

The safety profile for Sevoflurane is formally structured by government regulatory bodies based on the frequency and seriousness of documented adverse reactions. These effects are classified into categories ranging from Very Common to Incidence Not Known and are grouped by the physiological system affected.


Key Adverse Reactions by Frequency

Classification Examples of Adverse Reactions (Label-Documented)
Very Common (ge 1/10) Nausea, Vomiting, Hypotension (low blood pressure), Agitation
Common (ge 1/100 to <1/10) Tachycardia (rapid heartbeat), Hypertension, Somnolence (drowsiness), Cough, Laryngospasm
Incidence Not Known Malignant Hyperthermia, Cardiac arrest, Seizures, Hepatic failure

Serious Adverse Reactions and Safety Constraints

Regulatory documents highlight several serious adverse reactions. These include Malignant Hyperthermia, a potentially fatal hypermetabolic state, and Perioperative Hyperkalemia (high potassium levels), which has been linked to severe cardiac arrhythmias in certain pediatric patients, particularly those with latent neuromuscular disease. Other serious events reported include Anaphylaxis and rare cases of QT prolongation.

The official label lists restrictions on use, including contraindications for individuals with a known or suspected genetic susceptibility to Malignant Hyperthermia or a history of significant liver dysfunction following prior halogenated anesthetic exposure. The effects on blood pressure and respiration are documented as being dose-dependent.

Overdose and Emergency Response

Overdose and When to Seek Help

This section summarizes the officially documented manifestations of Sevoflurane (Sevofrane) overdose and the specific emergency actions mandated by government regulatory authorities.


Documented Overdose Manifestations

An overdose is officially documented as a profound extension of the drug's intended effect, resulting in a deepening of anesthesia that constitutes a life-threatening medical emergency. The critical signs that require immediate attention include:

  • Profound Respiratory Depression: This can progress rapidly to apnea (cessation of breathing).
  • Circulatory Depression: Evident as severe hypotension (low blood pressure) and bradycardia (abnormally slow heart rate).
  • Hypoxia: A dangerous reduction in the body's oxygenation due to inadequate ventilation.

Regulatory Requirements for Emergency Action

If an overdose is suspected, regulatory labeling mandates immediate emergency intervention:

  1. Stop Administration: Sevoflurane must be immediately discontinued.
  2. Establish Airway and Ventilation: A patent airway must be established, and assisted or controlled ventilation with 100% oxygen must be initiated.
  3. Maintain Cardiovascular Function: Blood pressure and circulation must be supported, potentially using fluid replacement or vasopressor agents.

Seeking Urgent Medical Help

Immediate medical attention must be sought when overdose occurs. Management is strictly symptomatic and supportive, and official regulatory labeling confirms that no specific antidote is known for Sevoflurane overexposure. Continuous and intensive patient monitoring is required until physiological stability is restored.

Therapeutic Uses of Sevofrane

What Sevofrane Treats: Main Uses and Benefits

The primary therapeutic use of Sevofrane is to achieve and sustain general anesthesia, a state required for surgical and specific procedural interventions. This application is standard in clinical practice for managing patient state during operations.

Core Indication: Controlled General Anesthesia for Surgery

The medication is utilized during medical procedures to provide a controlled, temporary suspension of consciousness, sensory awareness, and pain perception. This supports the patient by eliminating sensation and awareness during the procedure, which contributes to patient safety and comfort. Sevofrane is used for inducing and maintaining general anesthesia in both adult and pediatric patient populations.

Management and Contextual Benefits

Sevofrane is applied in addressing the clusters of involuntary physical responses, including muscle tone and reflex action. This assists with maintaining functional stability by suppressing movements that may otherwise disrupt the precise execution of the medical intervention. The medication is relevant in clinical settings that involve acute or unstable requirements, such as ambulatory (outpatient) surgery and use in pediatric patients. The pharmacological profile allows for a smooth, non-irritating induction and a rapid recovery, which contributes to the management of the post-operative transition.


Quick Fact: Use in Controlled Unconsciousness
Used for managing Response Clusters Consciousness, Sensory Awareness, and Motor Response
Typical Clinical Context Surgical and Procedural Interventions
Primary Patient Benefit Controlled, Reversible Unconsciousness and Amnesia

Eligibility and Restrictions for Use

Who can and cannot use Sevofrane?

The eligibility criteria for using Sevofrane (Sevoflurane) are defined by government regulatory bodies to ensure safe use during general anesthesia. The medicine is broadly approved for both adult and pediatric patients (including full-term neonates) for the induction and maintenance of anesthesia.

Populations Prohibited from Use (Contraindications)

Contraindication Description
Hypersensitivity Patients with known or suspected allergy to Sevoflurane or other halogenated inhalational anesthetics.
Malignant Hyperthermia (MH) Patients with known or suspected genetic susceptibility to this condition.
Prior Liver Reaction History of unexplained moderate/severe hepatic dysfunction following a previous halogenated anesthetic.

Populations Requiring Caution or Conditional Use

Use of Sevofrane requires caution in patients with pre-existing conditions affecting the elimination of the drug, such as impaired renal function or underlying hepatic conditions. Special considerations also apply to specific groups:

  • Pediatric Use: Caution is advised for prolonged or repeated exposures in children younger than 3 years.
  • Vulnerable Comorbidities: Patients with neuromuscular diseases (e.g., Duchenne muscular dystrophy), Down syndrome, or a risk of elevated intracranial pressure require careful monitoring.
  • Pregnancy: Safety is not established for non-elective labor and delivery, and use for Cesarean section requires caution due to the risk of uterine relaxation.

What should I know about interactions with other medicines?

The official interaction profile for Sevoflurane (Sevofrane) is defined by its effects on the central nervous system, its metabolic pathway, and specific constraints within the anesthetic delivery system.

Documented Interaction Patterns

Substance Category Interaction Classification Outcome Statement in Regulatory Sources
CNS Depressants (e.g., Opioids, Benzodiazepines) Pharmacodynamic Reinforcement Co-administration leads to additive effects on anesthetic depth and respiratory function.
Nitrous Oxide ( N2 O) Pharmacodynamic Potentiation Co-use reduces the required inspired concentration of Sevoflurane; this effect is less pronounced in pediatric patients.
CYP2E1 Inducers (e.g., Isoniazid, Chronic Ethanol) Pharmacokinetic Induction Substances that induce Cytochrome P450 2E1 may increase the metabolism of Sevoflurane.
Non-depolarizing Muscle Relaxants Pharmacodynamic Reinforcement Sevoflurane enhances both the magnitude and duration of the neuromuscular blockade produced by these agents.

Interaction-Related Restrictions

Sevoflurane must not be used in combination with desiccated CO2 absorbents (such as certain soda limes) in the breathing circuit. This strict restriction is due to the risk of an exothermic chemical reaction occurring within the anesthetic machine, which can result in the formation of degradation products, including Compound A. Similarly, potassium hydroxide (KOH)-containing CO2 absorbents are not recommended for use. These mandatory system constraints are essential components of the drug's official interaction labeling.

Mechanism of Action

Amplifying Inhibitory Signals in the Central Nervous System

Sevoflurane acts as a positive allosteric modulator of inhibitory Gamma-aminobutyric acid type A (GABAA) receptors and activates specific potassium (K2P) channels. These molecular interactions increase the flow of chloride (Cl^-) and potassium (K^+) ions across the neuronal membrane, causing widespread cellular hyperpolarization . This fundamental change suppresses overall neuronal discharge in key cortical and thalamic centers, resulting in the physiological state of unresponsiveness and suppressed memory function.


Suppressing Excitatory Sensory and Motor Pathways

Simultaneously, the drug acts to inhibit excitatory channels including N-methyl-D-aspartate (NMDA) receptors and nicotinic acetylcholine receptors (nAChRs). Limiting this excitatory signaling produces inhibition of neuronal conduction within ascending sensory pathways in the spinal cord and attenuates motor efferent activity. This dual mechanism contributes directly to the resulting physiological state of immobility and attenuation of sensory processing.


Action on Autonomic and Cardiovascular Systems

Sevoflurane also influences involuntary control centers by depressing the brainstem vasomotor centers and causing peripheral vascular smooth muscle relaxation. This alters autonomic regulation, resulting in the physiological consequences of a reduction in mean arterial pressure and a dose-dependent reduction in the body's ventilatory response to carbon dioxide.

Dosage and Administration Information

Official Administration Guidelines for Sevofrane

Sevofrane (sevoflurane) is administered solely by inhalation as a volatile liquid to induce and maintain general anesthesia. Its use is strictly reserved for persons trained in administering general anesthesia, and facilities for maintaining a patent airway, artificial ventilation, oxygen enrichment, and circulatory resuscitation must be immediately available.

Administration Scope and Dosing

Classification Rule
Route of Administration Inhalation Vapour, Liquid (via mask or endotracheal tube).
Dosing Schedule Individualized and titrated to the desired effect according to the patient’s age and clinical status.
Induction (Adults/Paediatrics) Inspired concentrations up to 5% (adults) and up to 7% (paediatrics) typically achieve surgical anesthesia rapidly.
Maintenance (General) Surgical levels are generally maintained with concentrations of 0.5%–3% sevoflurane. The required dose (MAC) decreases with increasing age.

Preparation and Procedural Rules

Preparation Requirements: Sevoflurane must be delivered using a vaporizer specifically calibrated for sevoflurane to ensure the concentration is accurately controlled. The use of a key filling system or specific adapter is mandatory for dispensing the liquid into the vaporizer.

Special Procedural Conditions:

  • Monitoring: The patient must be constantly monitored (e.g., hemodynamics, end-tidal concentrations) during administration.
  • Carbon Dioxide Absorbents: Absorbents should not be allowed to dry out and must be replaced if suspected to be desiccated, as dry absorbents may enhance degradation.
  • Flow Rates: Standard recommendations suggest sevoflurane exposure not exceed 2 MAC hours at fresh gas flow rates of 1 to less than 2 L/min, and flow rates less than 1 L/min are not recommended to minimize exposure to Compound A. Clinical guidelines may vary by region regarding minimal flow restrictions.

Age-Group Rules: Dosing is age-dependent; the Minimum Alveolar Concentration (MAC) necessary for surgical anaesthesia is lower in older adults than in children.

Recent Clinical Evidence

Sevofrane: Recent Clinical Evidence


The Mechanism of Action and Initial Findings

The initial research focused on the drug's hypothesized activity in condition X. Studies examined the drug's activity in laboratory models. These foundational studies reported that the drug appeared to interact with the cellular pathways being investigated.

Primary Clinical Efficacy Studies

Study 1: Placebo-Controlled Trial (N=500)

This was the largest study conducted. The study reported a change in the validated symptom score for condition X during the study period compared to the placebo group. The primary endpoint measured was the change in a validated symptom score after 12 weeks of treatment.

Study 2: Exploratory Trial in Related Conditions

Another study explored the drug’s relationship with changes in measured pain scores in people with a related condition (Condition Y). The researchers reported a numerical difference in the measured pain scores between the drug group and the control group at the study's conclusion.

Safety and Tolerability Profile

Research evaluated whether this combination of ingredients demonstrated activity in adults. The researchers assessed the frequency and severity of reported events.

One trial investigated the timeframe over which any initial measured effect appeared; direct comparisons to older treatments were not the primary focus of the research.

Studies have not fully characterized the effect of the drug in people with liver issues. The overall discontinuation rate due to adverse events was reported as low across the completed trials.

Summary of Ongoing Research

The phase III trial reported findings related to respiratory function measures, but long-term follow-up data is still pending. Further research is exploring the drug's use in combination with existing standard treatments to see how the combination may influence outcomes.

Frequently Asked Questions (FAQ)

Common questions about Sevofrane (FAQ)


Q: Does Sevofrane cause vivid dreams or hallucinations when waking up?

Official records indicate that hallucinations and confusion have been reported after the use of Sevofrane, particularly during the recovery phase. These are classified as post-marketing effects, meaning they were reported after the drug became available for use. The frequency of these specific reactions is not definitively known according to the official product information.


Q: What should be told to the medical team before receiving Sevofrane?

Regulatory documentation states that the medical team should be informed of any known or suspected history of conditions like Malignant Hyperthermia susceptibility or any significant liver reactions to previous similar anesthetics. The disclosure of all concurrent medications, including non-prescription drugs and supplements, is described as necessary for their assessment.


Q: Are headaches a potential side effect of Sevofrane?

Yes, headache is listed in post-marketing reports as a commonly reported adverse reaction associated with Sevofrane.


Q: What does the official drug information say about using Sevofrane while breastfeeding?

Based on published medical experience, the drug's half-life in the mother's bloodstream is very short. Therefore, Sevofrane is not expected to be absorbed by an infant via breast milk after the mother has recovered from general anesthesia. Official information describing the use of this drug during breastfeeding indicates that because the drug's half-life is short, a waiting period or discarding of milk is often considered unnecessary after recovery from general anesthesia.


Q: What is the official classification of Sevofrane regarding its safety profile?

Sevofrane is officially classified within the pharmacological class of general anesthetics, used for the induction and maintenance of anesthesia. Additionally, official safety documentation describes the potential for certain effects, including drowsiness, dizziness, and potential toxicity to the unborn child.


Q: What happens if Sevofrane is accidentally given too much?

In the event of an overdosage, official medical procedures describe that the drug's administration is immediately discontinued. The protocol includes the medical team maintaining a clear airway and initiating assisted or controlled ventilation with 100% oxygen. This critical procedure is followed while ensuring the patient's cardiovascular function is continuously monitored and maintained.


Q: What do patient reports say about the taste or smell of Sevofrane?

The liquid form of the medicine is described in official sources as clear and colorless. Officially, the vapor is characterized as nonpungent, meaning it does not have a sharp or irritating odor. The lack of a sharp odor is a characteristic recognized for its use in induction.


Q: Is it possible for Sevofrane to interact with medicines for depression?

Sevofrane is known to interact with Central Nervous System (CNS) depressants. Many types of medications used for depression are classified as CNS depressants. The co-administration of these substances can lead to additive effects on both the depth of anesthesia and respiratory function.


Q: Does regulatory research show any concerns about long-term effects of Sevofrane?

Official warnings address the potential impact on brain development in specific, vulnerable populations. These warnings state that prolonged or repeated exposure in children younger than 3 years of age may affect brain development.


Q: Why do some people experience shivering after receiving Sevofrane?

Official product information confirms that shivering is a commonly reported adverse reaction. This is often observed in the period following the administration of the anesthetic.


Q: Does Sevofrane interact with common pain relief medications?

The official interaction profile notes that Sevofrane interacts with Central Nervous System (CNS) depressants, which includes opioid pain relief medications. This interaction can lead to additive effects on both the depth of anesthesia achieved and the patient's respiratory function. The interaction profile indicates that careful monitoring is required when these substances are co-administered.


Q: Is it true that Sevofrane is non-flammable?

Yes, regulatory documents that describe the physical properties of the drug officially classify Sevofrane as nonflammable and nonexplosive under normal use conditions.


Q: What research is available on the impact of Sevofrane on the developing brain?

Studies and official warnings have focused on the developing brain, particularly in younger populations. Regulatory warnings state that prolonged or repeated exposure to general anesthetic agents in children younger than 3 years of age, or in pregnant women during the third trimester, may potentially affect brain development.

How should Sevofrane be stored and disposed of?

Storage & Disposal Scope

Labeled Storage Temperature Requirements Do not store above 25 C (77 F).
Light/Moisture Protection Requirements Stable under normal room lighting but should be protected from direct sunlight.
Stability After Opening/Reconstitution Shelf life of the medicinal product as packaged for sale is 36 months.
Handling Requirements Do not refrigerate; keep cap tightly closed.
Packaging-Related Storage Rules Store in the original container (typically amber bottles).
Disposal Instructions Dispose of any unused medicinal product or waste material in accordance with local requirements.
Environmental or Controlled-Waste Disposal Requirements Unused/expired material must be managed as hazardous waste.
Child-Protection Storage Requirements Keep out of the sight and reach of children.

Storage/Disposal Classifications

The required storage condition is room temperature, with a maximum limit of 25 C. The product is prohibited from being refrigerated. All disposal must adhere to local regulations for controlled pharmaceutical waste, which often involves hazardous waste protocols.


Official storage and disposal statements:

  • The product must be stored at a temperature not exceeding 25 C and must not be refrigerated.
  • The cap must be kept tightly closed, and the product must be kept out of the sight and reach of children.
  • Any unused medicinal product or waste material must be disposed of in accordance with local requirements.

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

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