A transient ischemic attack (TIA) is an acute episode of temporary and focal loss of cerebral function of vascular (occlusive) origin with a duration of usually less than 1 hour. They are rapid in onset and symptoms reach their maximal manifestation in fewer than 5 minutes (usually <1 min). Manifestations are of variable duration and typically last 2-15 minutes (rarely as long as 24 h). If you are already taking aspirin, adding extended-release dipyridamole may help as recent reports suggest that this combination is more effective than aspirin alone at preventing stroke, particularly in patients at high risk for stroke. Aspirin is ideally taken at a dose of 325 mg and if symptoms are increasing, it is better to take clopidogrel 75 mg orally once a day OR ticlopidine 250 mg orally twice a day. Blood sugar and BP must be maintained within normal limits.
I am afraid you must continue medication in consultation with your doctor.