neostigmine

Either of two related white crystalline compounds, C₁₂H₁₉BrN₂O₂ or C₁₃H₂₂N₂O₆S, that opposes the action of acetylcholinesterase and is used primarily to treat myasthenia gravis and to counteract muscle atony and muscle relaxants.

A parasympathomimetic, a reversible cholinesterase inhibitor.

a cholinergic drug (trade name Prostigmin) used to treat some ophthalmic conditions and to treat myasthenia gravis