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Health Discovery

Studies: Higher Risk of Diabetes, Muscle Pain From High-Dose Statins

FDA warns against prescribing higher dose

En español | The millions of Americans taking powerful cholesterol-lowering drugs called statins are reducing their risk of dying from cardiovascular disease, but a couple of recent developments have served as a reminder that these medications have rare but potentially serious side effects.

See also: Treating high cholesterol.

Muscle pain can be related to statin side effects

High-dose statins carry risks. — James King-Holmes/Photo Researchers, Inc.

Last week an international team of researchers reported that people on high doses of statins — 80 mg — have a slightly higher risk of developing diabetes than those on low or moderate doses of 10 mg, 20 mg or 40 mg. The research was based on the results of five major studies. And earlier this month, the Food and Drug Administration warned that doctors should not prescribe new patients the highest (80 mg) dose of simvastatin — a type of statin marketed under the brand name Zocor. But it said those who have been taking that dosage for a year or more without problems may continue to do so.

People taking the 80 mg-a-day dose of simvastatin face a higher risk of myopathy — muscle pain, tenderness or weakness — the FDA says. In extreme cases, patients may develop rhabdomyolysis, in which muscle tissue breaks down, sometimes leading to kidney failure and death.

As for the increased risk of diabetes, doctors warn that it's probably not enough to warrant going off statins in most cases.

"For every one case of extra diabetes, you're probably preventing three people from having a major cardiovascular event, so … the message is not that these people shouldn't be taking intensive statins," says David Preiss, M.D., a research fellow at the University of Glasgow and lead author of the study, published in the Journal of the American Medical Association (JAMA).

"We should be telling people that for whatever reason, the diabetes risk is going to go up a little bit," Preiss adds. "But my argument would be, that's a reasonable trade-off."

Higher dose, higher risks

Simvastatin drugs, like other statins, are widely prescribed because they have been shown to cut the risk of heart attacks and stroke by as much as half in some studies. Marketed by Merck as Zocor since the early 1990s, simvastatin is available in generic form and accounts for about half of all statin prescriptions (it is also an ingredient in Vytorin and Simcor). An estimated 2.1 million patients received prescriptions for medications containing 80 mg of simvastatin last year, the FDA says.

"The FDA has continuously updated the simvastatin drug label with new safety information regarding the risk of myopathy and rhabdomyolysis," says Amy Egan, M.D., a deputy director in the FDA's Center for Drug Evaluation and Research. Because of ongoing research, there have been seven such changes to the simvastatin label since 2001, she adds.

Next: Women over 65 are at most risk for muscle problems. >>

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