Adult: PO- Acute bronchospasm; Reversible airways obstruction- 80 mcg twice daily. Inhalation- Acute bronchospasm; Reversible airways obstruction- as inhalation cap: 12 mcg twice daily, up to 24 mcg twice daily in severe cases. As dry powder inhaler: 6 or 12 mcg 1-2 timesday, up to 24 mcg twice daily in sever cases. As metered doses from aerosol inhaler: 12 or 24 mcg twice daily. As nebuliser: 20 mcg twice daily. Prevention of exercise-induced bronchospasm 6 or 12 mcg at least 15 minutes before exercise. Additional doses may be given 12 hour later. It comes as a powder-filled capsule to inhale by mouth using a special inhaler.