Optimal Timing for Salbutamol Administration in Bronchospasm

Administration Timing and Methods

The American Academy of Allergy, Asthma, and Immunology recommends administering two inhalations 15-30 minutes before exercise for optimal prevention of exercise-induced bronchospasm, allowing for adequate bronchodilation before physical activity begins 1
In severe acute asthma, frequent bronchodilator therapy may be necessary, with doses of 1-3 mg/hour terbutaline or 0.3 mg/kg salbutamol hourly (to a maximum 10 mg/hour) having been used in clinical trials, as suggested by the British Thoracic Society 2
Treatment with a metered-dose inhaler (MDI) and spacer may be as effective and cheaper than nebulization for many patients, according to the British Thoracic Society 2
The American Thoracic Society notes that using salbutamol more than 3-4 times per week may lead to decreased effectiveness and should prompt consideration of controller medications 4
The onset of tolerance to salbutamol can be rapid, occurring within 12-24 hours after the first dose, as reported by the American Academy of Allergy, Asthma, and Immunology 1
Be cautious with daily use of β2-adrenergic agents alone or in combination with inhaled corticosteroids, as this can lead to tolerance manifested as reduced duration and magnitude of protection, as warned by the American Academy of Allergy, Asthma, and Immunology and the American Thoracic Society 1, 4