Ethopropazine hydrochloride is primarily used in the medical field as an antiparkinsonian agent. It helps manage symptoms of Parkinson's disease, such as tremors, rigidity, and bradykinesia, by acting as an anticholinergic drug. This compound works by blocking the action of acetylcholine in the central nervous system, thereby restoring the balance between dopamine and acetylcholine, which is crucial for motor control. Additionally, it has been utilized to treat drug-induced extrapyramidal symptoms, which are side effects often caused by antipsychotic medications. Its application extends to alleviating muscle spasms and providing relief in certain cases of dystonia.