Inexpensive statin drugs are given to millions of people to reduce cholesterol, even many who don't show signs of heart disease. A recent study has found that seniors with no history of heart trouble are now nearly four times more likely to get those drugs than they were in 1999. Here's the catch: For patients of that age, there is little research showing statins' preventive heart benefits outweigh possible risks, which can include muscle pain and the onset of diabetes. There have only been a handful of studies that included the over-79 population. The rate of statin use among octogenarians and beyond who don't have a history of heart attack, stroke, coronary heart disease or vascular heart disease quadrupled between 1999 and 2012. Concerns about statins' effects in those older than 79 are being raised as some cardiologists question whether statins are overprescribed even among some younger people. Dr. Steven Nissen, department chair of cardiovascular medicine at the Cleveland Clinic, suggests Congress legislate incentives for drugmakers to study a wider array of drugs and their effects on the very elderly. Most drugs aren't supported by hard clinical evidence to back up treatment in the elderly, he said. Ohio State's Dr. Michael Johansen, a co-author of the recent statins study, suggests doctors be more cautious. Muscle pains that some seniors on statins complain of might be so severe as to ... lead to life-threatening injuries, he suggested. "We just don't know," he said.