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Depolarizing Blockers: Pharmocokinetics

Depolarizing Blockers: Pharmocokinetics

Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...

Skeletal Muscle Relaxants: Adverse Effects

Skeletal Muscle Relaxants: Adverse Effects

Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
Unlike...

Parenteral Anesthetics: Overview

Parenteral Anesthetics: Overview

Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

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All neuromuscular blocking agents are injected intravenously because they are poorly absorbed from the GI tract. Rapid onset is achieved with intravenous administration, although absorption is also adequate from an intramuscular injection. Since these agents are highly ionized, they do not readily penetrate cell membranes or cross the blood-brain barrier.
Instead, they are transported by the blood to different tissues. Muscles with a greater blood supply (arteries) and blood flow receive more...

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...

Depolarizing Blockers: Mechanism of Action

Depolarizing Blockers: Mechanism of Action

Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because succinylcholine...

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Related Experiment Video

Updated: Jun 21, 2026

Coronary Angiography During Ex-Situ Heart Perfusion in a Porcine Model

Coronary Angiography During Ex-Situ Heart Perfusion in a Porcine Model

Published on: July 12, 2024

An update on sugammadex sodium.

Mark Welliver¹, Dennis Cheek

¹School of Nurse Anesthesia, Harris College of Nursing and Health Sciences, Texas Christian University, Fort Worth, Texas, USA. Mark.welliver@gmail.com

|August 4, 2009

Summary

This summary is machine-generated.

Sugammadex sodium, a modified gamma cyclodextrin, effectively and safely reverses neuromuscular blockade from rocuronium and vecuronium. Recent studies confirm its efficacy across various patient groups.

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Area of Science:

Anesthesiology
Pharmacology

Background:

Sugammadex sodium is a novel selective relaxant binding agent.
It is designed to reverse neuromuscular blockade induced by steroidal neuromuscular blocking agents.

Purpose of the Study:

To review recent phase II and III clinical data on sugammadex sodium.
To evaluate its efficacy and safety in reversing neuromuscular blockade.

Main Methods:

Analysis of published phase II and III clinical trial data.
Review of studies involving sugammadex sodium with rocuronium, vecuronium, and pancuronium.

Main Results:

Sugammadex sodium demonstrated fast, safe, and effective reversal of neuromuscular blockade induced by rocuronium and vecuronium at all levels.
Low levels of pancuronium-induced blockade were also reversed.
Efficacy in special populations (pediatric, elderly, cardiac, renal-compromised) was investigated.

Conclusions:

Sugammadex sodium is a safe and effective reversal agent for specific neuromuscular blocking agents.
Recent clinical data support its use in diverse patient populations.