Of those 10 some were prescribed the drug when it was contraindicated ( due to cirisosis,etc). So the number may 4 or 5. If the drug did not have success in improving the health of patients, the FDA would have banned it. There are hardly any life-saving drugs on the market that haven't killec some people. If the drug killed hundreds of people who were not contraindicated, the loss of 9.5 billion of shareholder value might be justified.