NCIt definition : A synthetic derivative of the alkaloid atropine with anticholinergic properties. Ipratropium
antagonizes the actions of acetylcholine at parasympathetic postganglionic effector
cell junctions. When inhaled, ipratropium binds competitively to cholinergic receptors
in the bronchial smooth muscle thereby blocking the bronchoconstrictor actions of
the acetylcholine (Ach) mediated vagal impulses. Inhibition of the vagal tone leads
to dilation of the large central airways resulting in bronchodilation.;