"Painkillers suspected of causing fatal heart disease may act by starting the process of hardening the arteries, researchers proposed on Thursday.
"The drugs, known as COX-2 inhibitors, include Merck and Co.'s Vioxx, which earned the company $2.55 billion a year but was pulled off the market on Sept. 30 after a study showed it doubled the risk of heart attack and stroke." [Reuters]
