The inhalational bronchodilator with long duration of action is:
Tiotropium bromide :
A newer congener of ipratropium bromide which binds very tightly to bronchial M1 / M3 muscarinic receptors producing long lasting bronchodilatation.
Reference: Essentials of Medical Pharmacology Eighth Edition KD TRIPATHI page no 128
Salbutamol
Theophylline
Ipratropium bromide
Tiotropium bromide