Cholinergic Drugs (Cholinomimetic, Parasympathomimetic): These are drugs that produce actions similar to that of ACh, either by directly interacting with cholinergic receptors (cholinergic agonists) or by increasing availability of ACh at these sites (anticholinesterases). CHOLINERGIC AGONISTS: Choline esters (Acetylcholine, Methacholine, Carbachol, Bethanechol). Alkaloids (Muscarine, Pilocarpine, Arecoline).