<prompt> The inhalational bronchodilator with long duration of action is:SalbutamolTheophyllineIpratropium bromideTiotropium bromide  <response>: 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 