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Adrenergic Agonists: Therapeutic Uses

Adrenergic Agonists: Therapeutic Uses

Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
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Allergic Reactions

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Adrenergic Agonists: Mixed-Action Agents

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...

Adrenergic Agonists: Direct-Acting Agents

Adrenergic Agonists: Direct-Acting Agents

Drugs that mimic the action of endogenous catecholamines like noradrenaline and adrenaline are called adrenergic agonists or sympathomimetics. Based on their mechanism of action, sympathomimetics can be classified as direct-, indirect-, or mixed-acting sympathomimetics. Direct-acting adrenergic agonists activate adrenoceptors without affecting presynaptic neurons, making them independent of neuronal catecholamine-depleting agents like reserpine and guanethidine.
These agents can be classified...

Adrenergic Agonists: Therapeutic Classification

Adrenergic Agonists: Therapeutic Classification

Adrenergic agonists can be classified based on their therapeutic uses and mechanisms of action. They serve various purposes in clinical applications.
Vasopressor or pressor agents: They increase blood pressure and function as cardiac stimulants. Examples include endogenous catecholamines (norepinephrine and dopamine) and synthetic agents (phenylephrine).
Bronchodilators: β2-agonists can relax bronchial muscles and widen airways. They are commonly used for treating obstructive pulmonary...

Drug Delivery: Enteral Route

Drug Delivery: Enteral Route

The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.

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Related Experiment Video

Updated: Jun 6, 2025

Measuring Local Anaphylaxis in Mice

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Alternatives to Injectable Adrenaline for Treating Anaphylaxis.

Guillaume Pouessel^1,2,3, Catherine Neukirch^4,5

¹Service de Pédiatrie, Pavillon Médicochirurgical de Pédiatrie, Boulevard Lacordaire, Roubaix, France.

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology

|November 24, 2024

Summary

New adrenaline nasal sprays offer an alternative to auto-injectors for anaphylaxis treatment. These innovative devices may improve medication use and effectiveness, addressing limitations of current adrenaline auto-injectors (AAI).

Keywords:

adrenaline allergy anaphylaxis auto‐injectors nasal sublingual

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Last Updated: Jun 6, 2025

Measuring Local Anaphylaxis in Mice

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Published on: October 14, 2014

Intracoronary Acetylcholine Provocation Testing for Assessment of Coronary Vasomotor Disorders

Intracoronary Acetylcholine Provocation Testing for Assessment of Coronary Vasomotor Disorders

Published on: August 18, 2016

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Published on: February 10, 2023

Area of Science:

Allergy and Immunology
Pharmacology
Medical Devices

Background:

Anaphylaxis requires immediate adrenaline treatment.
Adrenaline auto-injectors (AAI) are standard but have limitations hindering use.
Alternative administration routes are being explored to improve anaphylaxis management.

Purpose of the Study:

To review limitations of AAIs in anaphylaxis treatment.
To summarize data on novel adrenaline delivery devices using alternative routes.
To discuss the potential of non-injectable adrenaline for anaphylaxis.

Main Methods:

Literature review of AAI limitations and barriers.
Summary of pharmacokinetic, pharmacodynamic, and safety data for alternative adrenaline devices.
Analysis of approved non-injectable adrenaline devices.

Main Results:

AAIs have significant limitations leading to underuse.
Novel devices for nasal, sublingual, and transcutaneous adrenaline delivery are in development.
The first non-injectable adrenaline device (nasal spray) is approved for specific patient groups.

Conclusions:

Non-injectable adrenaline devices show promise for improving anaphylaxis treatment.
These innovations may overcome some AAI limitations, potentially increasing adrenaline use.
Multiple alternatives to injectable adrenaline are expected soon, enhancing anaphylaxis care.