NCIt definition : The iodide salt form of echothiophate, a long-acting cholinesterase inhibitor with
parasympathomimetic activity. Echothiophate iodide potentiates the action of endogenous
acetylcholine by inhibiting acetylcholinesterase that hydrolyzes acetylcholine. When
applied topically to the eye, this agent prolongs stimulation of the parasympathetic
receptors at the neuromuscular junctions of the longitudinal muscle of the ciliary
body. Contraction of longitudinal muscle pulls on the scleral spur, and opens the
trabecular meshwork, thereby increases aqueous humor outflow from the eye and reduces
intraocular pressure.;