Dear pasupu: Without evaluation, we cannot speculate on whether or not you had a TIA. Your neurologist would be best equipped to respond to this question. The concern regarding tamoxifen is that it has a slightly higher than average risk of causing blood clots. If you do have a history of a TIA related to a clot, there is concern that you may already be at higher risk of a thromboembolic event (such as a stroke, pulmonary embolus etc.). In terms of your situation, it might be beneficial to explore a multidisciplinary approach. Perhaps your oncologist could consult with your neurologist and they could evaluate risk versus benefit of the options and determine what options would be in your best interest, considering pros and cons.