Nonspecific muscarinic antagonist.
Central antiemetic effect at the area postrema and on the vestibular system
Peripheral antiemetic effect via inhibition of the vagus nerve
Anticholinergic side effects: dry mouth, mydriasis, tachycardia, urinary retention
Antidote: physostigmine (cholinesterase inhibitor)
**Open to other edit suggestions, but the card implies it is a specific M1 antagonist.