Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Yes, you should take it if there are blockages in your carotid arteries. Because, it s function is not just cholesterol lowering but has multiple other benefits and it s will prevent the blockage expansion. You may take it for any time you want, once you stop it cholesterol will again start rising to its baseline value. But if one has blockages then advisable to take lifelong. Hope I have answered your query. Let me know if I can assist you further.