<unk>  is an anticholinergic, antiparkinson agent that is FDA approved for the treatment of parkinson's disease, parkinsonism due to drug.   Common adverse reactions include nausea, xerostomia, dizziness, blurred vision, feeling nervous.
Trihexyphenidyl
Domiphen
Suvorexant
Metizoline
Diphenidol
Vigabatrin
Azidomorphine
Clobenzorex