does Alsprin prevent heart attack?

Yes, extensive study on a large population over a long period of time had shown it did help preventing heart attack. It is not the absolute stopper of heart attack. It reduces its likelyhood. An apple a day keeps the doctor away. An Asprin a day, keeps the heart atttack away.

No, it doesn't have the efficiency. It is just a cure for a headache.

阿斯匹林可以预防心脏病吗