| FIELD OF APPLICATION | DETAILS |
|---|---|
| Generic Name | Succinylcholine chloride |
| Active Ingredient | Succinylcholine chloride |
| US Brand Names | Anectine, Quelicin |
| Drug Category | Anesthesiology / Emergency Medicine / Critical Care |
| Drug Class | Depolarizing Neuromuscular Blocking Agent (Nicotinic Acetylcholine Receptor Agonist) |
| Route of Administration | Intravenous Injection, Intramuscular Injection |
| FDA Approval Status | FDA approved (August 1952) Approved |
Succinylcholine Chloride Overview
Succinylcholine chloride is a prescription depolarizing neuromuscular blocker used within our Clinic (General Medicine), operating rooms, and emergency departments. It is used to produce skeletal muscle relaxation during emergency airway management, routine endotracheal intubation, and brief surgical or diagnostic procedures.
What Is Succinylcholine Chloride & How Does It Work?
Succinylcholine chloride is a ultra-short-acting depolarizing muscle relaxant that acts as an agonist at acetylcholine receptors at the neuromuscular junction.
When injected, succinylcholine binds directly to nicotinic acetylcholine receptors on the motor end-plate of muscle cells. It causes prolonged depolarization of the muscle membrane, initially resulting in brief visible muscle twitching (fasciculations). Because succinylcholine is not broken down immediately by acetylcholinesterase, the muscle end-plate remains depolarized and desensitized to further stimulation. This leads to complete, temporary flaccid paralysis of skeletal muscles, allowing medical providers to insert a breathing tube easily.
Is Succinylcholine Chloride FDA Approved?
Yes, succinylcholine chloride is officially approved by the United States Food and Drug Administration.
What Is Succinylcholine Chloride Used For?
- Adjunct to general anesthesia to facilitate endotracheal intubation during emergency airway management or elective surgery.
- Skeletal muscle relaxation during brief surgical, diagnostic, or endoscopic procedures.
- Prevention or reduction of muscle contractions associated with electroconvulsive therapy (ECT).
Before Taking Succinylcholine Chloride: Contraindications & Precautions
Healthcare providers perform rapid screening for critical contraindications before administering succinylcholine chloride.
Who Should Not Receive Succinylcholine Chloride?
- Patients with a personal or family history of malignant hyperthermia (a life-threatening hypermetabolic crisis).
- Patients with skeletal muscle myopathies (such as Duchenne muscular dystrophy), particularly in pediatric patients.
- Patients recovering from major thermal burns, severe trauma, extensive denervation of skeletal muscle, or upper motor neuron lesions, as administration can cause fatal hyperkalemia.
- Individuals with known severe hypersensitivity or allergic reactions to succinylcholine chloride.
Succinylcholine Chloride, Pregnancy & Fertility
- Succinylcholine chloride should be used during pregnancy only if clearly needed. It crosses the placenta in minimal amounts and is widely used for rapid sequence intubation during emergency cesarean sections.
- Small amounts are unlikely to affect a nursing infant, though mothers should consult their care team after procedures requiring general anesthesia.
- Clinical studies have not shown direct evidence of impaired human fertility from brief clinical exposures.
Tell Your Doctor Before Receiving Succinylcholine Chloride
- Disclose any family history of anesthesia complications or high fevers during surgery.
- Mention if you have a history of atypical plasma cholinesterase or pseudocholinesterase deficiency.
- Inform your provider of recent major burns, crush injuries, spinal cord injuries, or prolonged immobility.
- Share if you have a history of high blood potassium (hyperkalemia) or advanced kidney failure.
- Provide a complete list of all current medications, including cholinesterase inhibitors or eye drops.
Succinylcholine Chloride Dosage & Administration
Succinylcholine chloride is administered exclusively by trained anesthesia professionals or emergency clinicians equipped with advanced airway control tools.
Standard Succinylcholine Chloride Dosing
- Dosing is strictly individualized based on actual body weight, route, and clinical indication.
- For endotracheal intubation (Intravenous): Adults typically receive 0.6 to 1.1 milligrams per kilogram (mg/kg) as a single rapid IV injection (average dose around 1 mg/kg).
- For endotracheal intubation (Intramuscular): Used when IV access is unavailable, at doses up to 3 to 4 mg/kg (maximum total dose 150 mg).
How Succinylcholine Chloride Is Administered
- Administered via rapid intravenous injection or deep intramuscular injection into a large muscle mass.
- Full mechanical ventilation equipment, 100% oxygen delivery, and emergency cardiac monitoring must be in place prior to administration.
- Paralysis onset is exceptionally rapid (typically within 30 to 60 seconds after IV injection).
Succinylcholine Chloride Clinical Efficacy & Research
Clinical evidence establishes succinylcholine chloride as the gold standard for rapid sequence intubation (RSI) when rapid airway control is required. Extensive research confirms its unmatched speed of onset (30 to 60 seconds) and short duration of action (4 to 6 minutes), allowing clinicians to secure an airway quickly in critical care and emergency settings.
Succinylcholine Chloride Side Effects & Safety Profile
Risk of Cardiac Arrest from Hyperkalemic Rhabdomyolysis: Acute rhabdomyolysis with hyperkalemia followed by ventricular arrhythmias, cardiac arrest, and death has occurred after the administration of succinylcholine to apparently healthy pediatric patients who were subsequently found to have undiagnosed skeletal muscle myopathy, most frequently Duchenne muscular dystrophy. Succinylcholine is contraindicated in pediatric patients for routine endotracheal intubation and should be reserved for emergency airway management or situations where immediate securing of the airway is necessary.
Succinylcholine causes profound respiratory muscle paralysis and significant potassium release into the blood.
Succinylcholine Chloride Severe Warnings
Succinylcholine chloride can trigger severe, fatal hyperkalemic cardiac arrest in susceptible individuals, particularly children with undiagnosed skeletal muscle myopathies or patients with denervation, burns, or trauma. It is also a potent trigger for malignant hyperthermia, requiring immediate treatment with IV dantrolene. Complete respiratory paralysis occurs immediately, requiring full mechanical ventilation.
Succinylcholine Chloride Common Side Effects
- Postoperative muscle soreness and stiffness (myalgia) caused by initial muscle fasciculations.
- Excess salivation during emergence.
- Mild increase in intragastric pressure.
- Temporary increase in intraocular (eye) or intracranial (brain) pressure.
Serious Succinylcholine Chloride Adverse Events
- Acute hyperkalemic cardiac arrest, particularly in patients with burns, denervation, or muscle disease.
- Malignant hyperthermia (rapid high fever, severe muscle rigidity, metabolic acidosis).
- Severe cardiac arrhythmias, bradycardia (especially with repeat doses or in children), or sudden cardiac arrest.
- Prolonged paralysis (apnea) in patients with pseudocholinesterase deficiency.
- Severe anaphylaxis or allergic bronchospasm.
Managing Succinylcholine Side Effects
Because succinylcholine is given in monitored operating rooms or emergency suites, side effects are treated instantly. Postoperative muscle pain is self-limiting and managed with mild analgesics. Bradycardia is prevented or treated with intravenous atropine. Suspected malignant hyperthermia is managed by immediate discontinuation of triggering agents, continuous cooling, 100% oxygen, and intravenous administration of dantrolene sodium.
Interactions & What to Avoid
Combining succinylcholine with drugs affecting neuromuscular transmission or electrolyte levels can prolong paralysis or increase toxicity.
Succinylcholine Chloride Interactions
- Cholinesterase inhibitors (such as neostigmine, pyridostigmine, or organophosphate pesticides) prolong succinylcholine-induced paralysis by inhibiting its breakdown.
- Inhaled volatile anesthetics (such as sevoflurane or isoflurane) increase the risk of malignant hyperthermia and enhance neuromuscular blockade.
- Certain antibiotics (such as aminoglycosides, polymyxins, or clindamycin) can potentiate neuromuscular paralysis.
- Cardiac drugs like digoxin or beta-blockers increase the risk of severe heart rate slowing (bradycardia) or arrhythmias.
Food & Alcohol
- Patients undergoing procedures requiring intubation must follow standard clinical fasting rules (nothing by mouth).
- Alcohol should be strictly avoided before and immediately following anesthesia.
Succinylcholine Chloride Missed Dose, Overdose & Storage
Strict institutional protocol governs the storage and single-use administration of succinylcholine.
Missed Dose of Succinylcholine Chloride
Succinylcholine is administered as a single dose by healthcare providers for immediate airway procedures, so missed dose scenarios do not apply.
Succinylcholine Chloride Overdose & Emergency
An overdose of succinylcholine results in prolonged muscle weakness, extended respiratory paralysis, and potential cardiovascular collapse. Reversal agents (like neostigmine) do not reverse succinylcholine and can actually worsen paralysis. Treatment relies on continuous mechanical ventilation and airway support until normal muscle and diaphragm function return spontaneously.
How to Store Succinylcholine Chloride
Stored in medical refrigerators between 2°C and 8°C (36°F and 46°F). Unrefrigerated storage at controlled room temperature up to 25°C (77°F) is permitted for limited multi-week periods depending on manufacturer stability guidelines. Protect from light.
Succinylcholine Chloride Patient Management & Monitoring
Patients receiving succinylcholine are continuously monitored by an advanced care team.
Tests Before Starting Succinylcholine Chloride
- Screening for personal or family history of malignant hyperthermia or atypical plasma cholinesterase.
- Assessment of serum potassium levels, especially in high-risk, burn, or trauma patients.
- Baseline physical evaluation of airway architecture and heart rhythm.
Monitoring During Succinylcholine Chloride Routine
- Continuous tracking of electrocardiogram (ECG), blood pressure, and oxygen saturation.
- Use of a peripheral nerve stimulator (train-of-four monitoring) to assess the depth and recovery of neuromuscular blockade.
- Continuous capnography (exhaled carbon dioxide) to verify correct breathing tube placement.
Succinylcholine Chloride Do’s and Don’ts
- Do inform your surgical team if you or anyone in your family ever had high fevers or complications under anesthesia.
- Do expect mild muscle aches similar to after a heavy workout when waking up from surgery.
- Don’t attempt to move, sit up, or pull at breathing equipment until fully awake and cleared by medical staff.
- Don’t drive or operate machinery for at least 24 hours after receiving anesthesia.
Frequently Asked Questions
What is succinylcholine chloride used for?
Succinylcholine chloride is a short-acting muscle relaxant used by medical providers to paralyze skeletal muscles rapidly. This allows an emergency or anesthesia doctor to place a breathing tube down the throat safely during surgery or critical emergencies.
How fast does succinylcholine work, and how long does it last?
When given into a vein, succinylcholine works within 30 to 60 seconds. Its muscle-relaxing effects are short-lived, typically wearing off completely within 4 to 6 minutes as the body breaks down the medication.
Why do muscles twitch right after getting succinylcholine?
Succinylcholine causes muscles to contract briefly before they become completely relaxed. These brief, harmless twitches are called fasciculations and happen because succinylcholine initially stimulates the muscle receptors before paralyzing them.
What is malignant hyperthermia?
Malignant hyperthermia is a rare, inherited reaction to certain anesthesia drugs like succinylcholine. It causes rapid, dangerously high body temperature, muscle rigidity, and breakdown. Operating suites keep emergency reversal medications (dantrolene) on hand to treat it immediately.
Why can’t succinylcholine be given to people with severe burns or trauma?
Severe burns, major nerve injuries, or crush trauma cause acetylcholine receptors to spread across muscle cells. Giving succinylcholine in these situations can cause a massive leak of potassium out of muscle cells into the blood, leading to sudden, severe heart cardiac arrest.
Can succinylcholine paralysis be reversed with a medication?
No. Unlike non-depolarizing muscle relaxants, succinylcholine cannot be quickly reversed with medications like neostigmine. Clinicians support the patient’s breathing with a mechanical ventilator until the body naturally breaks down the drug over a few minutes.
What causes muscle pain after receiving succinylcholine?
The initial muscle twitching (fasciculations) that occurs before paralysis can cause mild muscle soreness the next day, similar to how you feel after intense exercise. It typically goes away on its own within 24 to 48 hours.
References
- U.S. FDA – Anectine (succinylcholine chloride) prescribing information
- U.S. FDA Drugs@FDA – Drug approval overview
- American Society of Anesthesiologists (ASA) – Standards for Basic Anesthetic Monitoring
Legal Disclaimer
The information provided is for educational and informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider at any hospital or any local clinic before starting or stopping any medication.
