salbutamol
Ventolin (salbutamol, also known as albuterol) is a short-acting inhaled bronchodilator. It treats or prevents bronchospasm in people aged 4 years and older with reversible obstructive airway disease and prevents exercise-induced bronchospasm.
This page is based on FDA prescribing information for albuterol (salbutamol) inhalation aerosol, cross-checked with DailyMed and the National Cancer Institute dictionary; the mechanism is explained in plain language, and analogies are used only where they stay accurate.
How it works
Explains what the medicine does in the body, not dosing, side effects, or safety.
An analogy
During an asthma attack the bands of muscle around the airways clamp shut, like hands squeezing a straw. Salbutamol is an inhaled key that turns only the beta2 locks on those muscle bands. The bands let go, the straw opens, and air flows again.
In simple terms
Salbutamol is a short-acting sympathomimetic drug breathed in through an inhaler. It stimulates beta2-adrenergic receptors in the lungs, which activates the enzyme adenylate cyclase and raises levels of cyclic AMP inside airway smooth muscle. The higher cAMP level relaxes bronchial smooth muscle, relieves bronchospasm, and reduces the release of inflammatory mediators, especially from mast cells.
In depth
Salbutamol sulfate is a 1:1 racemic mixture of (R)-albuterol and (S)-albuterol with bronchodilator activity. It stimulates beta2-adrenergic receptors in the lungs, activating adenylate cyclase, which catalyses the conversion of ATP to cyclic-3-prime,5-prime-adenosine monophosphate (cAMP). Increased cAMP concentrations relax bronchial smooth muscle, relieve bronchospasm, and reduce inflammatory cell mediator release, especially from mast cells. To a lesser extent salbutamol also stimulates beta1-adrenergic receptors, which can increase the force and rate of myocardial contraction.
See it in motion
A schematic animation of the mechanism — simplified for clarity, not drawn to scale.
How salbutamol, a short-acting beta-2 agonist, relieves bronchospasm
- Salbutamol is a short-acting sympathomimetic drug breathed in through an inhaler.
- Salbutamol sulfate is a 1:1 racemic mixture of (R)-albuterol and (S)-albuterol with bronchodilator activity.
- It stimulates beta2-adrenergic receptors in the lungs, activating adenylate cyclase, which catalyses the conversion of ATP to cyclic-3-prime,5-prime-adenosine monophosphate (cAMP).
- Increased cAMP concentrations relax bronchial smooth muscle, relieve bronchospasm, and reduce inflammatory cell mediator release, especially from mast cells.
Target: Beta2-adrenergic receptors in the lungs
Receptors on airway smooth muscle; stimulating them raises cAMP inside the muscle cell, relaxing the airways and relieving bronchospasm.
Approved uses
Approved uses differ by country and change over time. Always follow your local prescribing information.
Approved uses in United States
FDA- For the treatment or prevention of bronchospasm in adult and pediatric patients aged 4 years and older with reversible obstructive airway disease
- For the prevention of exercise-induced bronchospasm in adult and pediatric patients aged 4 years and older
Official sources
The statements on this page trace back to these records.
- DailyMed: VENTOLIN HFA (albuterol sulfate) official US label
U.S. National Library of Medicine, DailyMed
- U.S. Food and Drug Administration: albuterol sulfate prescribing information
U.S. Food and Drug Administration
- National Cancer Institute: albuterol sulfate
National Cancer Institute
This page explains how the medicine works — it isn’t the patient leaflet. For anything that applies to you, read the leaflet that came with your medicine or ask your pharmacist.
MedUnfold provides educational content and is not medical advice. Always follow your local prescribing information and healthcare professional.