Molecular structure of salbutamol
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Volmax

Salbutamol (INN) or albuterol (USAN) is a short-acting β2-adrenergic receptor agonist used for the relief of bronchospasm in conditions such as asthma and COPD. It is marketed by the Allen & Hanbury's respiratory division of GlaxoSmithKline under the trade name Ventolin. The name Albuterol comes from Salbutamol aerosol. more...

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Salbutamol sulfate is usually given by the inhaled route for direct effect on bronchial smooth muscle. This is usually achieved through a metered-dose inhaler (MDI) or nebuliser; but other delivery devices marketed for salbutamol sulfate include the Rotahaler, Diskhaler, and Autohaler. Salbutamol can also be given orally (Volmax®) or intravenously.

Ventolin became available in the United Kingdom in 1969 and in the United States in 1980.

Clinical use

Salbutamol is specifically indicated in the following conditions:

  • acute asthma
  • symptom relief during maintenance therapy of asthma and other conditions with reversible airways obstruction (including COPD)
  • protection against exercise-induced asthma
  • certain conditions involving hyperkalemia

Salbutamol has many bad side effects, including shakiness and tremors.

As a β2-agonist, salbutamol also finds use in obstetrics. Intravenous salbutamol can be used as a tocolytic to relax the uterine smooth muscle to delay premature labour. Whilst preferred over agents such as atosiban and ritodrine, its role has largely been replaced by the calcium-channel blocker nifedipine which is more effective, better tolerated and orally administered. (Rossi, 2004)

Mode of action

As with other β2-adrenergic receptor agonists, salbutamol binds to β2-adrenergic receptors with a higher affinity than β1-receptors. In the airways, activation of β2-receptors results in relaxation of bronchial smooth muscle. resulting in a widening of the airway (bronchodilation). Inhaled salbutamol sulfate has a rapid onset of action, providing relief within 5-15 minutes of administration.

In tocolysis, the activation of β2-receptors results in relaxation of uterine smooth muscle, thus delaying labour.

Adverse effects

Whilst salbutamol is well-tolerated, particularly when compared with previous therapies such as theophylline, like all medications there exists the potential for adverse drug reactions to occur - especially when in high doses, or when taken orally or intravenously.

Common adverse effects include: tremor, palpitations and headache. (Rossi, 2004)

Infrequent adverse effects include: tachycardia, muscle cramps, agitation, hypokalemia, hyperactivity in children, and insomnia. (Rossi, 2004)

Other brand names

Salbutamol is sold under the brand names Airomir, Asmol, Proventil, Sultanol, Ventolin and Volmax.

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Volmax requires refrigeration. (Brand Watch).(Muro Pharmaceuticals Inc.'s Volmax drug, U.S. Food and Drug Administration standards)
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