Myonal contains the active ingredient Eperisone hydrochloride, acting as a muscle relaxant, vasodilator which improve overall blood circulation. The medication has been proven to alleviate symptoms of hypertonia by disrupting the pathological pathway leading to muscle spasm. Myonal also alleviates symptoms of shoulder spasticity, neck pain, headache due to muscle tension, back pain and limbs spasticity from central nervous system disorders.