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Related Concept Videos

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
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Depolarizing Blockers: Pharmocokinetics01:19

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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...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics01:11

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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.
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Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

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Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

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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.
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Updated: May 1, 2026

Ultrasound-guided Botulinum Toxin-A Injections: A Method of Treating Sialorrhea
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Subcutaneous vs intramuscular botulinum toxin: split-face randomized study.

Eli A Gordin1, Adam L Luginbuhl1, Timothy Ortlip2

  • 1Department of Otolaryngology-Head and Neck Surgery, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania.

JAMA Facial Plastic Surgery
|April 5, 2014
PubMed
Summary
This summary is machine-generated.

Subcutaneous (SC) and intramuscular (IM) injections of botulinum toxin A for forehead rejuvenation yield similar eyebrow lift results. SC injections may offer a less painful experience for patients seeking upper facial aesthetic improvements.

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Area of Science:

  • Plastic Surgery
  • Dermatology
  • Aesthetic Medicine

Background:

  • Botulinum toxin A injections are widely used for upper facial rejuvenation.
  • Optimal target tissue layer for botulinum toxin A administration in the forehead remains underexplored.

Purpose of the Study:

  • To compare the efficacy and patient experience of subcutaneous (SC) versus intramuscular (IM) administration of botulinum toxin A in the forehead.
  • To determine if tissue depth influences eyebrow elevation outcomes.

Main Methods:

  • A prospective, randomized study involving 19 patients undergoing forehead botulinum toxin A treatment.
  • Each patient received IM injection on one side and SC injection on the contralateral side.
  • Eyebrow height was measured at baseline, 2 weeks, 2 months, and 4 months post-injection; patient-reported outcomes on pain and satisfaction were also collected.

Main Results:

  • No statistically significant difference in eyebrow height was observed between SC and IM injection techniques.
  • Patients reported significantly greater discomfort with IM injections compared to SC injections.
  • Patient satisfaction showed no significant difference between the two techniques at early follow-ups, with a trend toward significance at the final visit.

Conclusions:

  • Subcutaneous administration of botulinum toxin A is as effective as intramuscular administration for achieving frontalis muscle paralysis and eyebrow elevation.
  • The SC route may provide a more comfortable injection experience for patients undergoing upper facial rejuvenation with botulinum toxin A.