NCIt definition : The bromide salt form of demecarium, a quaternary ammonium compound and a long-acting
cholinesterase inhibitor with parasympathomimetic activity. When used topically, demecarium
inactivates both pseudocholinesterase and acetylcholinesterase, thereby preventing
acetylcholine breakdown and increasing acetylcholine activity. This causes contraction
of the iris sphincter muscle (producing miosis) and the ciliary muscle (affecting
the accommodation reflex). In so doing, this agent increases the outflow of the aqueous
humor, thereby reducing intraocular pressure.;