• 40 years or older than 40 years;

• Acute cerebral ischemic event due to:

‣ Acute non-disabling ischemic stroke (NIHSS≤5 at the time of randomization) or,

⁃ TIA with moderate-to-high risk of stroke (ABCD2 score ≥ 6 at the time of randomization);

• Accompanied with symptomatic intracranial artery stenosis, defined as ≥ 50% stenosis of the infarcted ipsilateral intracranial artery. Intracranial arteries include intracranial segments of internal carotid arteries, intracranial segments of vertebral arteries, M1-M2 segments of middle cerebral arteries, A1-A2 segments of anterior cerebral arteries, P1-P2 segments of posterior cerebral arteries, and basilar artery. The techniques for detecting intracranial artery stenosis are limited to: MRA, CTA, or DSA. The measurement for the degree of stenosis has been established by the WASID (Warfarin-Aspirin Symptomatic Intracranial Disease) study. (AJNR Am J Neuroradiol. 2000;21:643-646.);

• Can be treated with study drug within 24 hours of symptoms onset\*(\*Symptom onset is defined by the last seen normal principle);

• Informed consent signed.