The purpose of this study is to determine whether a new research medication is effective and safe for the treatment of acute stroke when given within 6 hours of the onset of stroke.

Inclusion Criteria:

Males & females age 40-90 years

Enrolled in study within 6 hours of onset of stroke symptoms

Willing to sign informed consent form

No significant disabilities prior to stroke

Exclusion Criteria:

Treatment with t-PA (tissue plasminogen activator)

Premorbid modified rankin scale score of 2 or more