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Upper Respiratory Drugs: First and Second-Generation Antihistamines01:15

Upper Respiratory Drugs: First and Second-Generation Antihistamines

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Antihistamines are a class of drugs widely used to alleviate the symptoms of allergies, such as sneezing, itching, and nasal congestion. They work by inhibiting the actions of histamine, which is released by immune cells in response to allergenic substances or tissue injuries.
Histamine binds to specific receptor sites, known as H1 receptors, on tissue cells, triggering inflammation and swelling. Antihistamines combat these effects by competing with histamine for these receptor sites. By...
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Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs01:25

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Asthma is a chronic respiratory condition for which new therapeutic avenues, including anti-inflammatory drugs like mast cell stabilizers and anti-IgE treatments, continue to be developed.
Mast cell stabilizers, such as cromolyn (also known as sodium cromoglycate) and nedocromil (Tilade), are effective drugs in asthma management. These stabilizers hinder histamine release by skillfully obstructing the activation of mast cells and other cellular entities. Notably, they navigate this task without...
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Cholinergic Antagonists: Therapeutic Uses01:26

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Antimuscarinic drugs have various therapeutic applications by inhibiting parasympathetic stimulation in different systems. Here are the key therapeutic uses of antimuscarinics:    
Respiratory Tract: Ipratropium, aclidinium, and tiotropium treat asthma, chronic bronchitis, and chronic obstructive pulmonary disease (COPD). They protect against bronchoconstriction caused by irritants like cigarette smoke, sulfur dioxide, and ozone. They also help reduce nasopharyngeal...
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Cholinergic Antagonists: Pharmacokinetics01:24

Cholinergic Antagonists: Pharmacokinetics

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Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and...
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Allergic Reactions02:06

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Acid Suppressive Drugs for Peptic Ulcer Disease: Histamine H2-Receptor Antagonists01:28

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Histamine H2 receptors, which are intricately located on the basolateral membrane of parietal cells, play a crucial role in modulating gastric acid secretion. When released from enterochromaffin-like cells, histamine engages H2 receptors, initiating the cyclic AMP (cAMP) pathway. In this pathway, adenylyl cyclase converts ATP into cAMP, elevating intracellular cAMP levels. The activation of protein kinase A follows, stimulating the proton pump. This stimulation prompts the secretion of hydrogen...
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Related Experiment Video

Updated: Jun 29, 2025

Acupoint Catgut Embedding Therapy in Traditional Chinese Medicine for Managing Allergic Rhinitis
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[Antihistamines : An ongoing narrative].

Sophie Vandenberghe-Dürr1, Thomas Harr1, Frederik Vandenberghe2

  • 1Service d'immunologie et d'allergologie, Département de médecine, Hôpitaux universitaires de Genève, 1211 Genève 14.

Revue Medicale Suisse
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Summary

This review covers histamine receptor physiology, detailing H1, H2, H3, and H4 antagonists. It explores new drug developments, therapeutic uses, and side effects of antihistamines.

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Area of Science:

  • Pharmacology
  • Physiology
  • Drug Development

Background:

  • Histamine mediates diverse physiological processes via specific receptors.
  • Early H1 and H2 antagonists revolutionized allergy and acid reflux treatments.
  • Recent discovery of H3 and H4 receptors opens new therapeutic avenues.

Approach:

  • Comprehensive review of histamine receptor signaling pathways.
  • Analysis of the evolution of antihistamine drug discovery.
  • Examination of clinical applications and adverse effects of histamine antagonists.

Key Points:

  • Histamine's role extends beyond allergy, impacting neurological and immune functions.
  • New H3 and H4 receptor antagonists show promise for conditions like inflammatory diseases and neurological disorders.
  • Understanding histamine receptor subtypes is crucial for targeted drug development.

Conclusions:

  • The development of histamine receptor antagonists has significantly advanced medical treatments.
  • Ongoing research into H3 and H4 receptors promises novel therapeutic strategies.
  • This review provides essential insights into histamine pharmacology and antihistamine therapeutics.