Antiparkinsonian agent of the anticholinergic type
REVIEW Parkinsonism is thought to result from an imbalance between the excitatory (cholinergic) and inhibitory (dopaminergic) systems in the corpus striatum. The mechanism of action of centrally active anticholinergic drugs such as biperiden is considered to relate to competitive antagonism of acetylcholine at cholinergic receptors in the corpus striatum, which then restores the balance.
Nishiyama K, Mizuno T, Sakuta M, Kurisaki H: Chronic dementia in Parkinson's disease treated by anticholinergic agents. Neuropsychological and neuroradiological examination. Adv Neurol. 1993;60:479-83.