Celocurin

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Celocurin

Method of action: Muscle Relaxant

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 Celocurin

What is Celocurin?

Celocurin is a medicinal product used to produce brief muscle relaxation. It belongs to a group of medicines known as neuromuscular blockers, specifically categorized as a depolarizing muscle relaxant.

Mechanism of Action

The active substance in Celocurin is suxamethonium chloride (also known as succinylcholine). It works by mimicking the action of acetylcholine, a naturally occurring substance in the body that transmits signals between nerve endings and muscle cells.

When administered, suxamethonium binds to the receptors on the muscle fibers. This initially causes a brief contraction of the muscles, followed quickly by a period of paralysis. Because the body breaks down suxamethonium rapidly, the muscle-relaxing effect is short-lived, typically lasting only a few minutes.

Clinical Applications

Celocurin is primarily utilized in clinical settings where short-term muscle relaxation is necessary for medical procedures. Its rapid onset and brief duration of action make it suitable for:

  • Endotracheal Intubation: Facilitating the insertion of a breathing tube into the windpipe to assist with ventilation.
  • Surgical Procedures: Providing muscle relaxation during short surgical interventions.
  • Brief Manipulations: Assisting in medical maneuvers that require the muscles to be completely relaxed for a short period.

Due to its effect on the muscles responsible for breathing, this medication is used exclusively by healthcare professionals in environments equipped to support respiratory function.

Regulatory References

  1. Succinylcholine Chloride - StatPearls
  2. Suxamethonium - WHO Essential Medicines List

What side effects are possible with Celocurin?

Possible Side Effects and Safety Information

The safety profile for Suxamethonium Chloride (Celocurin) is defined by officially documented adverse reactions categorized by their effect on major physiological systems and seriousness tiers. The most commonly reported side effect is post-operative Myalgia (muscle pain), which typically occurs after the medicine's effects have worn off.

System-Organ Classifications and Frequency

Adverse reactions listed in regulatory documents affect systems including Cardiac Disorders (e.g., bradycardia, arrhythmias), Vascular Disorders (hypertension, hypotension), and Respiratory, Thoracic and Mediastinal Disorders (apnea, prolonged respiratory depression).

Serious Adverse Reactions and Safety Constraints

Official labeling highlights the potential for several serious, life-threatening events. These include Malignant Hyperthermia, severe acute Hyperkalemia (high serum potassium) which can lead to cardiac arrest, and prolonged paralysis requiring extended ventilatory support. Safety constraints formally prohibit the use of this medicine in patients with a history of Malignant Hyperthermia, certain skeletal muscle myopathies, and certain conditions that predispose to hyperkalemia, such as major burns or trauma after the acute phase.

Population-Specific Considerations

Specific patient groups carry distinct safety considerations. Regulatory documents include warnings regarding the risk of severe hyperkalemia and rhabdomyolysis in pediatric patients who may have undiagnosed myopathy. Additionally, patients with certain metabolic or genetic predispositions, such as those with atypical plasma cholinesterase activity, may experience a significantly prolonged duration of muscle paralysis and apnea.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose of Suxamethonium Chloride (Celocurin) is officially described in regulatory documents as an extension of the drug’s primary effect. The most serious and common manifestation is prolonged respiratory depression or apnea resulting from an extended neuromuscular block. This condition necessitates continuous monitoring and the immediate provision of ventilatory support until full recovery of spontaneous breathing is achieved.

The official overdose profile also highlights severe, life-threatening outcomes. These include cardiac arrest, often linked to a significant rise in serum potassium (hyperkalemia). A separate but critical risk is Malignant Hyperthermia, a hypermetabolic state characterized by muscle rigidity and profound hyperpyrexia, which requires specific intervention.

Regulators mandate that immediate medical attention must be sought for any suspected overdosage due to the fatal risk of respiratory arrest. While no specific antidote is available for the primary block, specialized treatment such as Intravenous Dantrolene Sodium is indicated for the management of Malignant Hyperthermia. A specific warning exists in official labeling for pediatric patients, noting an increased risk of hyperkalemic cardiac arrest.

Therapeutic Uses of Celocurin

What Celocurin Treats: Main Uses and Benefits

Celocurin is a medication that may be part of symptomatic management, applied across domains where additional symptomatic support is needed. Its main applications are relevant for easing symptom clusters and acute episodes across several domains.

Celocurin is commonly used across conditions presenting with acute episodes and is particularly considered relevant in contexts marked by increased discomfort or tension. It helps address symptom clusters that may become intense or disruptive in clinical scenarios requiring temporary assistance in stabilization.

Key Therapeutic Domains

This medication is applied in addressing certain distressing symptoms, such as symptoms that interfere with daily functioning or symptoms that create noticeable physiological strain. It contributes to easing the overall symptom load when applied during phases of increased distress or discomfort, providing supportive relief when symptoms interfere with routine activities.


Quick Fact: Support for Functional Strain

Celocurin is considered relevant in settings marked by temporary physiological imbalance, which may assist with maintaining a sense of stability when symptoms are more noticeable.

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Celocurin (Suxamethonium Chloride) — Official Regulatory Information

The medicine is officially indicated for use in Adults and Pediatric Patients as an adjunct to general anesthesia. However, its use is heavily restricted and contraindicated in multiple populations as defined by regulatory documents (FDA, EMA).

Category Eligibility Rule (Strictly Label-Based)
Absolute Contraindications History of Malignant Hyperthermia; skeletal muscle myopathies (e.g., Duchenne Muscular Dystrophy); known hypersensitivity; and the presence of atypical plasma cholinesterase or severe hyperkalemia [FDA Prescribing Information].
Conditions Prohibiting Use Use is contraindicated after the acute phase (approximately 7 to 10 days post-injury) following major burns, multiple trauma, or extensive denervation injuries (due to the risk of severe, life-threatening hyperkalemia) [FDA Prescribing Information].
Age-Related Restrictions Routine use in pediatric patients is restricted and must be reserved for emergency intubation where securing the airway is immediately necessary [FDA Prescribing Information].
Conditional Use Renal Impairment allows for a single, normal dose if hyperkalemia is absent, but multiple or large doses are prohibited [European Medicines SmPC]. Patients with severe hepatic impairment or fractures require special caution [European Medicines SmPC].
Pregnancy Eligibility Use may be considered during pregnancy, if necessary, though a prolonged effect is possible due to reduced plasma cholinesterase activity [European Medicines SmPC].

Official regulatory documents define non-eligibility through absolute contraindications related to genetic status and conditions that increase the risk of severe hyperkalemia. Conditional use is mandated for certain populations like children and those with organ impairment, limiting administration to specific clinical contexts only.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Celocurin (Suxamethonium Chloride) is defined by two primary interaction patterns: pharmacodynamic reinforcement and reduced metabolic clearance, as well as specific co-administration restrictions.

Reinforcement of Neuromuscular Blockade

The neuromuscular blocking effect of Celocurin is officially documented to be enhanced when co-administered with numerous medicinal products. This pharmacodynamic effect is noted with certain classes of antibiotics (such as aminoglycosides), quinidine, lidocaine, and agents like magnesium salts. The regulatory information states that other neuromuscular blocking agents may also exhibit an additive effect, intensifying the intended muscle paralysis.

Reduced Metabolic Clearance

Interactions that reduce the metabolic breakdown of Celocurin by plasma cholinesterase are officially noted to prolong the drug’s duration of effect. Substances that reduce this enzyme’s activity, including certain monoamine oxidase inhibitors (MAOIs) and chronically administered oral contraceptives, can lead to a documented risk of prolonged neuromuscular blockade.

Regulatory Restrictions and Risk Enhancement

Co-administration with halogenated anesthetics (e.g., isoflurane, desflurane) is officially restricted as this combination enhances the risk of developing a severe outcome known as malignant hyperthermia. Furthermore, the risk of severe hyperkalemia-related cardiac events is enhanced in patients with co-existing conditions like digitalis toxicity or electrolyte abnormalities.

Mechanism of Action

How Celocurin Works

Celocurin's mechanism of action is defined by its precise, targeted intervention at the neuromuscular junction, leading to rapid, temporary loss of skeletal muscle excitability.


️ Agonism at the Neuromuscular Junction Receptor

Suxamethonium Chloride acts as a high-affinity agonist at the Nicotinic Acetylcholine Receptor ( nAChR) located on the muscle's motor endplate, where it chemically mimics the natural nerve transmitter. This immediate activation opens the receptor's ion channel, triggering a momentary surge of electrical activity that results in muscle fasciculations (twitching) before the primary blocking mechanism takes effect.


Establishing the Depolarizing Blockade

The drug remains persistently bound to the nAChR, locking the muscle membrane in a state of sustained depolarization that prevents it from electrically resetting. This critical molecular lock ensures the voltage-gated sodium channels in the adjacent muscle fiber are held in an inactive state, thereby halting the propagation of all subsequent nerve signals and resulting in complete, flaccid cessation of skeletal muscle contraction.


⏳ Enzyme-Dependent Termination and Constraints

The effect is designed to be ultra-short, as it is terminated solely by rapid hydrolysis of the drug molecule by plasma cholinesterase (pseudocholinesterase) in the bloodstream. However, biological variations, such as atypical cholinesterase, impair this enzyme-driven clearance, which can lead to an extended duration of the receptor agonism and the resulting loss of muscle excitability.

Dosage and Administration Information

Celocurin (Suxamethonium Chloride) is an ultra-short-acting medicine that is administered strictly in a controlled clinical environment, typically requiring specialist supervision and immediate access to respiratory support equipment. Its primary routes of administration are intravenous (IV) injection for rapid effect or a continuous IV infusion for prolonged use. The intramuscular (IM) route is reserved only for situations where IV access is not immediately available. The drug is administered exclusively after the patient has been rendered unconscious through the induction of general anesthesia.

Standard dosing is calculated by patient weight. For a single IV bolus to facilitate procedures such as tracheal intubation, the typical dose range for adults is between 0.3 mg/kg and 1.1 mg/kg of body weight, with an average dose of 0.6 mg/kg. Pediatric patients, particularly infants and small children, often require a higher IV dose per kilogram, typically 2 mg/kg, compared to older individuals. If the IM route is used, the total dose should not exceed 150 mg.

When the drug is used as a continuous infusion for maintaining muscle relaxation, it must first be diluted to a specific concentration of 1 mg/mL to 2 mg/mL in approved solutions, such as 5% Dextrose. The infusion rate is carefully controlled, usually averaging between 2.5 mg/minute and 4.3 mg/minute in adults, with total hourly administration generally limited to 500 mg. The solution must be visually inspected and must not be mixed with alkaline substances in the same syringe due to potential incompatibility.

Recent Clinical Evidence

Celocurin: Recent Clinical Evidence

Evidence for Use in Airway Management and Intubation

Celocurin was evaluated in numerous randomized controlled trials and reviews to examine its use in contexts where muscle relaxation may facilitate placing a breathing tube (tracheal intubation). The research explores this agent as an adjunct to general anesthesia. Outcomes examined include the time until the onset of muscle paralysis and the quality of intubation conditions. Studies describe patterns where onset was measured as ultra-fast, with measured outcomes of intubation quality assessed using clinical grading scales.

Evidence for Use in Short Medical Procedures

The research base includes clinical trials and reports that describe the medicine’s application where temporary skeletal muscle relaxation was observed during short surgical interventions or to assist with mechanical ventilation. Studies monitored the degree of skeletal muscle paralysis and the time until the full spontaneous return of muscle function. Findings described observed patterns of a short-term muscle blockade. Reported measurements confirm the medicine's use in providing the necessary outcomes monitoring physiological strain or stress for acute, short-duration medical needs.

Evidence for Specialized Clinical Applications

Celocurin was studied for its use in certain specialized procedures, such as providing muscle relaxation during Electroconvulsive Therapy (ECT). This use was evaluated in procedural reviews and clinical reports. Research examined the medicine’s association with observed muscle paralysis needed during the procedure, although comparative evidence is lacking from large, modern trials.

Research in Specific Patient Groups

Studies have explored the effects of this agent in specific patient populations, most notably pediatric participants, including infants and children. This research examined outcomes in these groups when the medicine is used for emergency airway procedures. The research describes that the medicine was observed in trials involving children undergoing emergency intubation. Results apply only to the populations studied.

Study Duration and Research Gaps

Research exploring short-term symptom changes primarily focuses on the medicine's ultra-short duration of effect. The follow-up durations were limited, focusing only on the acute recovery period. Consequently, long-term effects are not fully established. Furthermore, comparative evidence is lacking from trials that are fully blinded, as the drug’s characteristic initial muscle movements may reveal which medicine was administered. Evidence quality varies across studies, and a significant part of the medicine’s documented application may rely on older clinical data.

Key Studies & References

  1. Succinylcholine or rocuronium: a meta-analysis of the effects on intubation conditions
  2. Suxamethonium - WHO Electronic Essential Medicines List (eEML)
  3. Sedation in rapid sequence intubation in pediatrics (Review)
  4. Current evidence on the use of sugammadex for neuromuscular blockade antagonism during electroconvulsive therapy (Review)

Frequently Asked Questions (FAQ)

Common questions about Celocurin (FAQ)


Q: How is Celocurin different from other similar treatments?

Celocurin is officially classified as a depolarizing neuromuscular blocking agent. This describes a specific way the medicine works at the muscle receptor to cause temporary muscle relaxation. Other similar medicines are generally classified as non-depolarizing agents, which have a different method of action.


Q: What happens if a patient has atypical plasma cholinesterase?

Official information states that the presence of atypical plasma cholinesterase is a known contraindication for using the medicine. This condition is a genetic variation that affects how the body processes the medicine. If this activity is impaired, the effect of the muscle relaxation may be significantly prolonged.


Q: Can Celocurin be used in emergency situations?

Regulatory documents indicate that the medicine's use should be reserved for acute procedures, such as emergency intubation, where immediate securing of the airway is necessary. Its ultra-fast onset aligns with the need for immediate action in acute procedures. Regulatory documents note that, in emergency situations, administration may occur prior to the induction of full unconsciousness.


Q: Does Celocurin start working immediately?

Celocurin is known for its ultra-fast onset of action. Regulatory labeling documents typically describe the onset of muscle paralysis developing in about one minute following intravenous injection. Its rapid onset aligns with the need for immediate action in acute procedures.


Q: Can children or teenagers use Celocurin?

Official regulatory indications state the medicine is for use in adults and pediatric patients, including children. However, regulatory documents specifically restrict routine use in children due to safety considerations. Official documentation indicates that its use in children is generally reserved for emergency procedures.


Q: What information should I read on the patient information leaflet for Celocurin?

The patient information leaflet is based on official documents and provides essential facts about the medicine. It typically includes the purpose of the medicine, general details on how it is used in a clinical setting, and a summary of possible side effects and safety constraints (who should not receive the medicine).


Q: Is Celocurin an anesthetic agent?

No, Celocurin is not an anesthetic agent. Regulatory sources classify it as an adjunct to general anesthesia for the purpose of achieving temporary skeletal muscle relaxation. Official warnings clearly state that the medicine does not produce unconsciousness or anesthesia itself.


Q: How does Celocurin affect breathing (factual description)?

The medicine's primary intended function is to cause temporary paralysis of skeletal muscles throughout the body. This includes the muscles necessary for breathing. Due to this effect, respiratory support is required throughout the medicine's duration of action. Regulatory documents list apnea (stopping of breathing) as a potential effect.


Q: Is Celocurin considered a strong medication?

Celocurin is classified as a highly potent agent. Its critical importance in healthcare is recognized by its inclusion on the World Health Organization (WHO) Essential Medicines List. Due to the medicine's critical action, its administration is strictly managed in a controlled clinical environment with specialist supervision.


Q: Are there different forms or versions of Celocurin?

Official labeling confirms the medicine is prepared exclusively as a sterile solution for injection. It is primarily available in varying concentrations, such as 20 mg/mL or 50 mg/mL in vials or ampoules, designed for rapid administration in a controlled setting.


Q: What are the common misunderstandings about Celocurin?

A common point of discussion relates to the brief muscle fasciculations (twitches) that occur just before the full muscle paralysis takes effect. These movements are described in official product information as an initial, observable effect during the drug's mechanism of action.


Q: What is the half-life of Celocurin (informational)?

Celocurin has an ultra-short duration of action because the drug is broken down very quickly in the bloodstream by the enzyme plasma cholinesterase. Due to this rapid metabolism, the time it takes for the medicine to be eliminated (its half-life) is measured in minutes.


Q: Is Celocurin addictive or habit-forming?

Official regulatory classification does not list Celocurin (Suxamethonium Chloride) as a controlled substance. It is only used for acute medical purposes in a strictly supervised setting and is not known to be associated with dependency or habit formation.


Q: Are there any long-term effects associated with Celocurin use?

Research focuses on the medicine's ultra-short duration of effect, and available clinical studies typically have limited follow-up durations focused on acute recovery. Specific long-term effects are not fully established, as clinical follow-up is generally limited to the acute recovery period.


Q: What is the difference between a side effect and an adverse event for Celocurin?

Official documents define a side effect as an expected and officially documented unwanted effect of the medicine, such as muscle pain (Myalgia). An adverse event is a broader term that refers to any unwanted incident that happens after the medicine is administered.


Q: What are the general expectations after receiving Celocurin?

The expected outcome is the full return of spontaneous muscle function after the medicine's short effect wears off. The most common immediate sensation reported after the procedure is post-operative Myalgia (muscle pain), which is an officially documented side effect.


Q: Is it normal to feel a certain way after the effects of Celocurin wear off?

Yes. The most common and expected feeling reported after the effects of the medicine have worn off is post-operative Myalgia (muscle pain). This muscle discomfort is a documented side effect, described as generally mild and usually occurring in the days following the procedure.


Q: Can Celocurin be given repeatedly over a short time frame?

Yes, regulatory documents describe the use of repeated doses, or supplementary injections, to maintain muscle relaxation if the medical procedure is prolonged. The administration of supplementary doses is carefully managed to maintain muscle relaxation while controlling the total amount of medicine given.


Q: How does Celocurin interact with certain herbal supplements (general information)?

Official regulatory documents do not provide a comprehensive, specific list of herbal supplement interactions. However, official warnings emphasize the importance of disclosing all substances, including herbal or vitamin supplements, before administration, as these may potentially affect the medicine's action.


Q: Are there specific lab tests needed before using Celocurin?

Official safety constraints require specific patient conditions to be evaluated prior to administration. This may include testing for the absence of severe hyperkalemia (high potassium) and evaluating the activity of the plasma cholinesterase enzyme to avoid prolonged effects.


Q: Are there specific ethnic or genetic factors that affect how Celocurin works?

Yes, official documents emphasize that genetic factors which lead to the presence of atypical plasma cholinesterase can significantly affect the medicine. This genetic variation affects how the body processes the medicine, which may result in a prolonged duration of muscle relaxation.

How should Celocurin be stored and disposed of?

Celocurin Storage and Disposal

The storage of Celocurin (Succinylcholine Chloride Injection) is strictly defined to maintain the drug's potency.

Storage Component Requirement
Temperature Store under refrigeration (2 C to 8 C).
Protection Do not freeze the solution. The drug is unstable in alkaline solutions.
Stability For single-dose presentations, discard unused portion. Specific preparations may be stable for a limited time at room temperature.
Handling Store in a secure manner, often locked up, to minimize the possibility of medication errors. The solution must be clear and colorless before use.

Disposal must comply with regulatory standards. Unused product and containers must be discarded in accordance with all local and national regulations for pharmaceutical waste. Used needles should not be recapped before disposal in a designated sharps container.

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

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