Remifentanil

Remifentanil

Remifentanil 2D Chemical Structure

Remifentanil is a potent, short-acting synthetic opioid analgesic drug. It is used in anesthesia to provide analgesia during surgical procedures. Remifentanil is known for its rapid onset and short duration of action, which makes it particularly useful in settings where quick recovery from anesthesia is desired.

Pharmacology

Remifentanil is a μ-opioid receptor agonist, which means it binds to and activates the μ-opioid receptors in the central nervous system. This action results in analgesia, sedation, and respiratory depression. The unique feature of remifentanil is its rapid metabolism by nonspecific blood and tissue esterases, leading to a very short half-life of approximately 3 to 10 minutes. This rapid metabolism allows for precise control over the drug's effects, making it ideal for use in surgical anesthesia.

Clinical Use

Remifentanil is primarily used in anesthesia for its analgesic properties. It is often administered as a continuous intravenous infusion during surgery to maintain a stable level of analgesia. Due to its short half-life, remifentanil is not suitable for postoperative pain management, as its effects dissipate quickly once the infusion is stopped.

Side Effects

The side effects of remifentanil are similar to those of other opioids and include respiratory depression, bradycardia, hypotension, and muscle rigidity. Because of its rapid onset and offset, careful monitoring is required to avoid complications such as respiratory depression.

Chemical Structure

R-30490

Remifentanil is chemically related to fentanyl, but it has a unique ester linkage that is rapidly hydrolyzed by esterases. This structural feature is responsible for its rapid metabolism and short duration of action. The chemical name of remifentanil is 1-(2-methoxycarbonyl-ethyl)-4-(phenylpropionylamino)-piperidine-4-carboxylic acid methyl ester.

Derivatives

Tert-butyl Remifentanil

Several derivatives of remifentanil have been synthesized to explore variations in pharmacokinetics and pharmacodynamics. One such derivative is tert-butyl remifentanil, which has been studied for its potential use in clinical settings.

Related Pages

• Fentanyl
• Opioid
• Anesthesia
• Analgesic