Research Area: Neurological Disease Biological Activity: Biperiden is an antiparkinsonian agent of the anticholinergic type. It is used for the adjunctive treatment of all forms of Parkinson’s disease (postencephalitic, idiopathic, and arteriosclerotic). Biperiden has an atropine-like blocking effect on all peripheral structures which are parasympathetic-innervate. It also has a prominent central blocking effect on M1 receptors. [1]