Patients on the drug showed a tendency towards a slightly lower rate of heart attacks and unstable angina, although this was not statistically significant.

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In the 4, 162-person PROVEIT study, Harvard cardiologists found that patients hospitalized for heart attacks or unstable angina who took a 80-milligram dose of Lipitor were 16% less likely to suffer heart attacks or other cardiovascular "events" over two years than those who took a lower dose of Bristol-Myers Squibb 's (nyse: BMY - news - people ) Pravachol.

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