Trimetaphan camsilate is a drug that counteracts cholinergic transmission at the ganglion type of nicotinic receptors of the autonomic ganglia and therefore blocks both the sympathetic nervous system and the parasympathetic nervous system. It acts as a non-depolarizing competitive antagonist at the nicotinic acetylcholine receptor, is short-acting, and is given intravenously.
Hexamethonium chloride is a preferential nicotinic receptor blocker at the level of autonomic ganglia. It has been shown to cross the blood-brain barrier only in high doses.
Oxybutynin R-isomer , also known as Aroxybutynin, is a muscarinic receptor antagonist. Aroxybutynin is the optically avtice inhibitor of proliferation and supresses gene expression in bladder smooth muscle cells. Oxybutynin exerts direct antispasmodic effect on smooth muscle and inhibits the muscarinic action of acetylcholine on smooth muscle. It exhibits one-fifth of the anticholinergic activity of atropine on the rabbit detrusor muscle, but four to ten times the antispasmodic activity. No blocking effects occur at skeletal neuromuscular junctions or autonomic ganglia (antinicotinic effects).