NCIt definition : A muscarinic antagonist with muscle relaxant activity. Although the mechanism of action
has not been determined, orphenadrine appears to block muscarinic acetylcholine receptors
as well as N-methyl-D-aspartate (NMDA) receptors in the central nervous system (CNS).
This may interfere with the transmission of nerve impulses from the spinal cord to
the muscles and may help relax muscles. In addition, orphenadrine exerts antagonistic
effects on histamine H1 receptors.;