A muscarinic receptor<unk>  is an agent that reduces the activity of the muscarinic acetylcholine receptor. Most of them are synthetic, but scopolamine atropine are belladonna alkaloids, and are naturally extracted.
Important muscarinic agonists include atropine, hyoscine, ipratropium, tropicamide, cyclopentolate and pirenzepine.
Muscarinic antagonist
Muscarinic agonist
Alpha-adrenergic agonist
Adrenergic agonist
Beta-adrenergic agonist
Serotonin antagonist
Nicotinic antagonist
H₂-receptor antagonist