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Drugs Affecting GI Tract Motility: Serotonin Receptor Agonists01:23

Drugs Affecting GI Tract Motility: Serotonin Receptor Agonists

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Serotonin, a crucial neurotransmitter synthesized by enterochromaffin cells, plays a cardinal role in regulating gastrointestinal (GI) motility. With over 90% of the body's total serotonin in the GI tract, its influence on digestive processes is profound. Serotonin is swiftly released upon various stimuli, such as food boluses or certain drugs, triggering intrinsic sensory neurons in the myenteric plexus and extrinsic vagal and spinal sensory neurons. This leads to the activation of the...
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Antidepressant Drugs: MAOIs and Other Agents01:23

Antidepressant Drugs: MAOIs and Other Agents

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Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
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Antidepressant Drugs: Tricyclics, SSRIs, and SNRIs01:28

Antidepressant Drugs: Tricyclics, SSRIs, and SNRIs

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Tricyclic Antidepressants (TCAs), including Desipramine (Norpramin), Imipramine (Tofranil), Clomipramine (Anafranil), and Amitriptyline (Elavil), inhibit serotonin and norepinephrine reuptake and also block other receptors. They are used for depression, pain conditions, and insomnia. Common adverse effects include anticholinergic effects, sedation, orthostatic hypotension, and weight gain. They have a narrow therapeutic window and so require plasma-level monitoring. Abrupt discontinuation can...
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Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

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Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
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G-protein Coupled Receptors01:21

G-protein Coupled Receptors

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Chemotherapy-Induced Nausea and Vomiting: 5-HT3 Receptor Antagonists01:27

Chemotherapy-Induced Nausea and Vomiting: 5-HT3 Receptor Antagonists

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5-HT3 receptor antagonists, such as dolasetron, granisetron (Kytril), ondansetron (Zofran), and palonosetron (Axoli), are crucial in managing chemotherapy-induced nausea and vomiting (CINV) and postoperative nausea. These drugs selectively block 5-HT3 receptors in the visceral vagal and spinal afferent nerves, chemoreceptor trigger zone, and the vomiting center. They have a rapid onset of action and can be given as a single dose before chemotherapy. Ondansetron and granisetron, in particular,...
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Related Experiment Video

Updated: May 4, 2026

Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome
08:49

Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome

Published on: September 23, 2015

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Serotonin syndrome.

Jacqueline Volpi-Abadie1, Adam M Kaye2, Alan David Kaye2

  • 1Department of Anesthesiology, Ochsner Clinic Foundation, New Orleans, LA.

Ochsner Journal
|December 21, 2013
PubMed
Summary
This summary is machine-generated.

Serotonin syndrome, a serious condition from serotonergic drugs, involves mental, neuromuscular, and autonomic changes. Increased physician awareness of drug interactions is key to preventing this potentially fatal syndrome.

Keywords:
Drug toxicityserotonin syndrome

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Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Neuroscience

Background:

  • Serotonin syndrome is a life-threatening condition caused by overactivation of serotonin receptors (5HT-1A, 5HT-2A).
  • It presents with altered mental status, neuromuscular hyperactivity, and autonomic dysfunction.
  • This syndrome can arise from therapeutic drug use, overdose, or drug interactions involving serotonergic agents.

Purpose of the Study:

  • To review the presentation and management of serotonin syndrome.
  • To identify specific drugs and interactions that precipitate this condition.
  • To enhance physician awareness and recognition of this potentially fatal yet preventable syndrome.

Main Methods:

  • Literature review of serotonin syndrome presentation, management, and causative agents.
  • Analysis of drug interactions leading to serotonergic overactivity.
  • Synthesis of information to guide clinical recognition and treatment.

Main Results:

  • Numerous commonly prescribed medications can precipitate serotonin syndrome.
  • Complex drug interactions involving multiple serotonergic agents are a significant cause.
  • Early recognition and intervention are crucial for patient outcomes.

Conclusions:

  • Increased physician education and awareness are vital for accurate diagnosis.
  • Prompt and appropriate treatment can significantly reduce morbidity and mortality.
  • Understanding drug mechanisms and interactions is essential for preventing serotonin syndrome.