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...th a wide variety of effects. It is a [[competitive antagonist]] for the [[muscarinic acetylcholine receptor]]. It is classified as an [[anticholinergic drug]]. ...tem]]. This occurs because atropine is a [[competitive antagonist]] of the muscarinic [[acetylcholine receptor]]s ([[acetylcholine]] being the main [[neurotransm

...hestjournal.org/cgi/pmidlookup?view=long&pmid=138578}}</ref> It blocks the muscarinic cholinergic receptors in the smooth muscles of the bronchi in the lungs. Th ...bronchoconstriction]] and [[mucus]] [[secretion]]. It is a non-selective [[muscarinic]] [[Receptor antagonist|antagonist]], and does not diffuse into the blood,

The prokinetic activity of metoclopramide is mediated by [[muscarinic]] activity, D₂ receptor antagonist activity and 5-HT₄ ...been superseded by the more effective [[5-HT3 antagonist|5-HT₃ antagonists]] (e.g. [[ondansetron]]).

...7.016 |url=}}</ref> GHB's sedative effects are blocked by GABA_B antagonists. ...inhibition and increase of dopamine release by GHB are inhibited by opioid antagonists such as [[naloxone]] and [[naltrexone]]. Dynorphin may play a role in the i