Remifentanil: Effects, Dosage and Side Effects
Remifentanil is a short-acting opioid analgesic used primarily for pain control during surgical procedures and in intensive care settings.
Things worth knowing about "Remifentanil"
Remifentanil is a short-acting opioid analgesic used primarily for pain control during surgical procedures and in intensive care settings.
What is Remifentanil?
Remifentanil is a synthetic opioid analgesic belonging to the fourth generation of piperidine derivatives. It is administered exclusively intravenously and is characterized by an extremely rapid onset of action and a very short duration of effect. Due to its unique pharmacological profile, it is used predominantly in anesthesiology and critical care medicine.
Mechanism of Action
Remifentanil binds selectively and with high affinity to mu-opioid receptors in the central and peripheral nervous system. This binding inhibits pain signal transmission, reduces pain perception, and produces a pronounced analgesic effect. It also exerts respiratory depressant and sedative effects.
The distinguishing feature of remifentanil is its metabolism by nonspecific tissue and blood esterases. Unlike most opioids, it is not metabolized by the liver or kidneys but is hydrolyzed by esterases present in blood and tissues. As a result, its duration of action is independent of hepatic or renal function and lasts only approximately 3 to 10 minutes.
Indications and Clinical Uses
Remifentanil is used in the following clinical situations:
- General anesthesia: As a component of balanced anesthesia for intraoperative pain control
- TIVA (Total Intravenous Anesthesia): Typically in combination with propofol
- Intensive care: For analgesia and sedation in mechanically ventilated patients
- Obstetrics: Patient-controlled intravenous analgesia (PCIA) during labor pain
- Painful diagnostic or interventional procedures
Dosage
The dosage of remifentanil must be individually tailored to the patient and the clinical situation. Typical dosage ranges include:
- Induction of anesthesia: 0.5 to 1 microgram per kilogram of body weight intravenously over 30 to 60 seconds
- Maintenance of anesthesia: 0.1 to 0.5 micrograms per kilogram per minute as a continuous infusion
- Intensive care analgesia: 0.025 to 0.2 micrograms per kilogram per minute
Due to its short half-life and rapid onset, remifentanil is administered exclusively as a controlled intravenous infusion via a syringe pump (perfusor). Bolus administration outside a monitored clinical setting is not permitted.
Side Effects
Like all opioids, remifentanil can cause a range of side effects. The most common include:
- Respiratory depression: The most important and potentially life-threatening side effect; requires monitoring and ventilatory support
- Bradycardia and hypotension: Decreased heart rate and blood pressure
- Muscle rigidity: Particularly of the chest wall muscles with rapid injection (opioid-induced chest wall rigidity)
- Nausea and vomiting
- Pruritus (itching)
- Opioid-induced hyperalgesia: With prolonged or high-dose use, paradoxically increased pain sensitivity may develop
Contraindications
Remifentanil must not be used in the following situations:
- Known hypersensitivity to remifentanil or other opioid analgesics
- Epidural or intrathecal administration, as the formulation contains glycine, which may be neurotoxic
- Any setting without secured airway management and the ability to provide mechanical ventilation
Special Properties and Advantages
Remifentanil offers several clinically relevant advantages over other opioids:
- Context-sensitive half-life: The duration of effect does not increase with prolonged infusion, as metabolism is esterase-based and independent of infusion duration
- No accumulation: Even in patients with renal or hepatic impairment, the drug does not accumulate
- Precise controllability: The depth of analgesia can be adjusted within minutes by changing the infusion rate
- Rapid recovery: Patients regain consciousness very quickly after the infusion is stopped
Drug Interactions
Remifentanil may interact with the following substances:
- Other CNS depressants (e.g., benzodiazepines, propofol, barbiturates): Enhanced sedative and respiratory depressant effects
- MAO inhibitors: Potentially life-threatening interactions are possible; remifentanil should not be used concomitantly with or shortly after MAO inhibitors
- Muscle relaxants: Possible potentiation of neuromuscular blockade
References
- Summary of Product Characteristics for Ultiva (Remifentanil) - European Medicines Agency (EMA), current version.
- Patel S.S., Spencer C.M. - Remifentanil. Drugs. 1996;52(3):417-427. PubMed PMID: 8875130.
- Egan T.D. - Remifentanil pharmacokinetics and pharmacodynamics. A preliminary appraisal. Clinical Pharmacokinetics. 1995;29(2):80-94.
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