Biperiden is primarily used in the treatment of Parkinson's disease and other conditions involving involuntary muscle movements. It helps to control symptoms such as tremors, stiffness, and spasms by balancing certain natural substances in the brain. Additionally, it is effective in managing the side effects of antipsychotic medications, particularly those related to involuntary muscle movements like tardive dyskinesia. Biperiden is also utilized in cases of drug-induced extrapyramidal symptoms, providing relief from muscle rigidity and restlessness. Its anticholinergic properties make it useful in reducing excessive salivation and sweating associated with these conditions.