After hospital admission and diagnosis, patient will be handled as per acute ischemic stroke management in each study site. Right after the patient is confirmed eligible to the study, the treatment(s) will be switched immediately into the study treatments. Clinical and laboratory examinations to evaluate the investigational drug's efficacy will be performed at baseline and 3, 7,14, and 28 days after study medication initiation; while safety examinations will be performed at the same time point, but 3 and 14 days after study medication initiation.