Salbutamol
Short-acting bronchodilator for asthma and COPD.
Salbutamol, also known as albuterol and sold under the brand name Ventolin among others, is a medication that opens up the medium and large airways in the lungs. It is a short-acting β2 adrenergic receptor agonist that causes relaxation of airway smooth muscle. It is used to treat asthma, including asthma attacks and exercise-induced bronchoconstriction, as well as chronic obstructive pulmonary disease (COPD). It may also be used to treat high blood potassium levels. It is on the World Health Organization's List of Essential Medicines.
- field
- Pharmacology / Respiratory Medicine
- known_for
- Short-acting bronchodilator for asthma and COPD
- brand_name
- Ventolin
Lore & Background
It is a short-acting β2 adrenergic receptor agonist that causes relaxation of airway smooth muscle. The tertiary butyl group in salbutamol makes it more selective for β2 receptors, which are the predominant receptors on the bronchial smooth muscles. Activation of these receptors causes adenylyl cyclase to convert ATP to cAMP, beginning the signalling cascade that ends with the inhibition of myosin phosphorylation and lowering the intracellular concentration of calcium ions.
Reader's Guide
Salbutamol is a cornerstone medication in respiratory medicine, primarily used to treat asthma and COPD. Its rapid onset of action (within 15 minutes when inhaled) and duration of two to six hours make it a standard rescue inhaler for acute bronchospasm. It is also used off-label for acute hyperkalemia and in obstetrics as a tocolytic, though its role in delaying premature labour has largely been replaced by nifedipine. Common side effects include shakiness, headache, and fast heart rate; serious side effects may include worsening bronchospasm and low blood potassium levels. Salbutamol metered dose inhalers have been described as the 'single biggest source of carbon emissions from NHS medicines prescribing' due to propellants, with dry powder inhalers recommended as a low-carbon alternative. It remains on the World Health Organization's List of Essential Medicines and was the seventh most commonly prescribed medication in the United States in 2023.
Did You Know?
- It is on the World Health Organization's List of Essential Medicines.
- In 2023, it was the seventh most commonly prescribed medication in the United States, with 59 million prescriptions.
- Salbutamol metered dose inhalers have been described as the 'single biggest source of carbon emissions from NHS medicines prescribing'.
Frequently Asked Questions
Who is Salbutamol?
Salbutamol is a short-acting bronchodilator medication, known as albuterol in the US and most widely recognized by the brand name Ventolin. It belongs to the β2 adrenergic receptor agonist class and works by relaxing smooth muscle in the medium and large airways of the lungs.
What is Salbutamol's role in treatment?
Its primary job is to rapidly open constricted airways, making it a standard rescue inhaler for acute asthma attacks and exercise-induced bronchoconstriction. It is also prescribed for chronic obstructive pulmonary disease and can help lower dangerously elevated blood potassium levels.
How does Salbutamol actually work?
It selectively stimulates β2 adrenergic receptors, triggering relaxation of the smooth muscle lining the bronchial tubes. This reduces airway resistance and allows air to flow more freely, providing quick relief from breathing difficulty.
Why is Salbutamol considered so important in respiratory medicine?
As one of the most widely prescribed rescue medications globally, it gives asthma and COPD patients immediate, reliable relief during acute episodes. Its fast onset and short duration of action make it the standard first-line intervention when airways suddenly narrow.
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