LONDON — A cheap drug that can stop bleeding in recently injured accident patients could potentially save the lives of tens of thousands worldwide, a new study says. Researchers studied the effects of tranexamic acid, or TXA, in more than 10,000 adult trauma patients in 40 countries who received the drug within eight hours of being injured. They compared those patients’ outcomes to more than 10,000 accident victims who got a placebo treatment. The study was published online today in the medical journal Lancet. Doctors found that patients who got TXA had a 15 percent lower chance of dying from...