Adults: For the relief of acute bronchospasm and for managing intermittent episodes of asthma: one or two inhalation as a single dose;
For chronic maintenance or prophylactic therapy: two inhalations three or four times daily; for prevention of exercise induced bronchospasm: two inhalations before exertion.
Children: For the relief of acute bronchospasm, management of episodic asthma and for prevention of exercise induced bronchospasm: one inhalation;
For routine maintenance and prophylaxis: one inhalation three or four times daily, increasing if necessary to two inhalations three or four times daily.
Elderly: The dosage is the same as that for adults.