respinRespin LS is a combination of risperidone and trihexyphenidyl used to treat schizophrenia and mania. It works by modulating the chemical messengers in the brainRespin is a selective monoaminergic antagonist having a hh affinity for serotoninergic 5-HT2 and dopaminergic D2 receptors. Respin binds also to alpha1 adrenergic