A Clinical Trial To Evaluate Efficacy And Safety Of Levophencynonate Hydrochloride In Patient With Vertigo

Inclusion Criteria: 1. At the age more than 18 years old male or female; 2. Patients with vertigo caused by Posterior Circulation Infarction. 3. Patients diagnosed Posterior Circulation Infarction based on the criteria of Posterior Circulation Ischemia of America; 4. Meet the diagnose criteria of vertigo: Visual Motion (External Vertigo), or Rotation, Swing, Lift and Tilt Sensation (Internal Vertigo); 5. Ability to sign the statements of informed consent; Exclusion Criteria: 1. Female patients having Pregnant, Lactating or Birth plan recently; 2. Non-posterior circulation infarction patients; 3. Vertigo caused by any other diseases; 4. Long-term alcohol abuse, or drug abuse; 5. Been in critical condition, difficult to make a precise evaluation of efficacy and safety of new drugs; 6. History of allergies on Levophencynonate Hydrochloric or these compositions; 7. Participation in another clinical trial in three months; 8. Investigator thought that should be excluded due to other reason;