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Upper Respiratory Drugs: Decongestants

Upper Respiratory Drugs: Decongestants

Decongestants are a class of medications used primarily to alleviate nasal congestion, a common symptom resulting from allergies, colds, sinusitis, and other upper respiratory tract infections. These drugs work by activating α-adrenergic receptors, constricting small blood vessels in the nasal membranes. This action results in the opening of clogged nasal passages, thereby facilitating sinus drainage and relieving congestion.
Most decongestants are readily available over-the-counter in various...

Drugs Used in Upper Respiratory Disorders: Overview

Drugs Used in Upper Respiratory Disorders: Overview

Upper respiratory tract disorders, including viral infections and allergic rhinitis, cause significant discomfort and disrupt daily life. Managing these conditions involves a variety of drugs, such as antihistamines, intranasal steroids, decongestants, antitussives, expectorants, and mucolytics. Specific examples of drugs in each category are provided.
Antihistamines (e.g., Benadryl) block histamines from binding. Histamines are chemicals released during an allergic reaction in the body. As a...

Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics

Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics

Respiratory symptoms, such as congestion and cough, commonly accompany respiratory tract conditions. Various medications, such as antitussives, expectorants, and mucolytics, play crucial roles in providing relief.
Antitussives include codeine, dextromethorphan (Robitussin), and benzonatate (Tessalon). Codeine and dextromethorphan exert their effects centrally by suppressing the cough reflex center in the medulla. Benzonatate operates peripherally within the respiratory tract by anesthetizing...

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...

Epistaxis

Epistaxis

Epistaxis, or nosebleeds, occurs when small, swollen blood vessels in the nasal mucous membrane rupture. Typically, the anterior septum is the primary site of occurrence.
Etiology
Possible causes of this condition include high blood pressure, trauma, low humidity, upper respiratory tract infections, allergies, foreign bodies, nasal inhalation of corticosteroids or illicit drugs, excessive use of decongestant nasal sprays, facial or nasal surgery, anatomic malformation, tumors, or systemic...

Upper Respiratory Drugs: First and Second-Generation Antihistamines

Upper Respiratory Drugs: First and Second-Generation Antihistamines

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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Related Experiment Video

Updated: Jul 17, 2026

Intranasal Administration of CNS Therapeutics to Awake Mice

Intranasal Administration of CNS Therapeutics to Awake Mice

Published on: April 8, 2013

Nasal decongestants for the common cold.

D Taverner¹, J Latte

¹Royal Adelaide Hospital, Internal Medicine, Adelaide, South Australia, Australia, 5000. dtaverne@mail.rah.sa.gov.au

The Cochrane Database of Systematic Reviews

|January 27, 2007

Summary

Nasal decongestants offer modest short-term relief for adult common cold congestion. While generally safe, they are not recommended for children under 12 due to insufficient data.

Area of Science:

Pharmacology
Clinical Trials
Respiratory Medicine

Background:

The common cold is a frequent cause of illness, with nasal congestion being its most prevalent symptom.
Numerous therapies exist for cold symptom relief, yet a meta-analysis of controlled trials on nasal decongestants was lacking.

Purpose of the Study:

To evaluate the effectiveness of nasal decongestants in alleviating nasal congestion in adults and children with the common cold.
To identify potential adverse effects associated with nasal decongestant use.

Main Methods:

A systematic review and meta-analysis of randomized, placebo-controlled trials involving single-active oral and topical nasal decongestants.
Searched multiple databases (CENTRAL, MEDLINE, OLDMEDLINE, EMBASE) and contacted investigators and pharmaceutical companies.

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Extracted data on subjective and objective outcomes, calculating weighted mean difference (WMD) and standardized mean difference (SMD).

Main Results:

Seven studies in adults met criteria; none in children.
A single dose of nasal decongestant showed a modest 6% decrease in subjective congestion and improved nasal airways resistance compared to placebo.
Repeated doses over 3-5 days provided a small 4% benefit, with rare and mild adverse events, including a slight increase in insomnia with pseudoephedrine.

Conclusions:

Oral nasal decongestants provide modest, short-term relief for adult common cold congestion.
Benefits are observed with regular use over 3-5 days, with rare, mild side effects in adults.
Insufficient data exists for children, thus nasal decongestants are not recommended for those under 12 with the common cold.