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For the relief of bronchospasm: Rapid-acting inhaled beta2-agonists, such as salbutamol, should be used only on as-needed basis at the lowest dose and frequency required.
Adults and children ≥4 years old: 100 or 200 mcg (1 or 2 inhalations) as needed, every 4 to 6 hours, or, as prescribed by a doctor.
The bronchodilator effect of each administration of salbutamol inhaler lasts for at least 4 hours. If a previously effective fixed dosage fails to provide the usual relief, consult a physician for medical advice as this is a sign of worsening of asthma that would require reassessment of therapy (see Precautions).
For the prevention of exercise-induced bronchospasm: Adults: 200 mcg (2 inhalations) 15 to 30 minutes before exercise.
Children ≥4 years old: 100 or 200 mcg (1 or 2 inhalations) 15 to 30 minutes before exercise.
Or, as prescribed by a physician.
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