Is Clopidogrel effective in preventing secondary stroke in a 65-year-old man who recently had a stroke? Ischemic stroke is caused by a blood clot in an area of ​​the brain, leading to loss of neural function if it lasts more than 24 hours. In the United States, ischemic stroke affects 2.7% of men and 2.5% of women aged 18 years and older. Furthermore, it has been reported that approximately 610,000 and 185,000 new cases of stroke and recurrent stroke occur in the United States each year. Furthermore, it has been reported that patients who have suffered a stroke are more likely to experience stroke recurrence, myocardial infarction and death from vascular causes2. One of the risk factors for ischemic stroke is the formation of plaques in the blood vessels that cause blood clots3. Several randomized trials have also reported that antiplatelet drugs are effective in preventing stroke recurrence in patients who have had an episode of ischemic stroke. Antiplatelet drugs to prevent stroke recurrence are aspirin, the combination of aspirin and extended-release dipyridamole, and clopidogrel alone4. Ha...