FDA Expands Advice on Statin Risks
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- Liver Injury Called Rare
- Reports of Memory Loss
- The Risk of Diabetes
- The Potential for Muscle Damage
If you're one of the millions of Americans who take statins to prevent heart disease, the Food and Drug Administration (FDA) has important new safety information on these cholesterol-lowering medications.
FDA is advising consumers and health care professionals that:
- Routine monitoring of liver enzymes in the blood, once considered standard procedure for statin users, is no longer needed. Such monitoring has not been found to be effective in predicting or preventing the rare occurrences of serious liver injury associated with statin use.
- Cognitive (brain-related) impairment, such as memory loss, forgetfulness and confusion, has been reported by some statin users.
- People being treated with statins may have an increased risk of raised blood sugar levels and the development of Type 2 diabetes.
- Some medications interact with lovastatin (brand names include Mevacor) and can increase the risk of muscle damage.
This new information should not scare people off statins, says Amy G. Egan, M.D., M.PH., deputy director for safety in FDA's Division of Metabolism and Endocrinology Products (DMEP). “The value of statins in preventing heart disease has been clearly established,” she says. “Their benefit is indisputable, but they need to be taken with care and knowledge of their side effects.”
FDA will be changing the drug labels of popular statin products to reflect these new concerns. (These labels are not the sticker attached to a prescription drug bottle, but the package insert with details about a prescription medication, including side effects.)
The statins affected include:
- Altoprev (lovastatin extended-release)
- Crestor (rosuvastatin)
- Lescol (fluvastatin)
- Lipitor (atorvastatin)
- Livalo (pitavastatin)
- Mevacor (lovastatin)
- Pravachol (pravastatin)
- Zocor (simvastatin).
Products containing statins in combination with other drugs include:
- Advicor (lovastatin/niacin extended-release)
- Simcor (simvastatin/niacin extended-release)
- Vytorin (simvastatin/ezetimibe).
Liver Injury Called Rare
FDA has found that liver injury associated with statin use is rare but can occur. Patients are advised to consult their health care professional if they have symptoms that include unusual fatigue, loss of appetite, right upper abdominal discomfort, dark urine or yellowing of the skin or whites of the eyes.
Statins work in the liver to reduce the production of cholesterol, a waxy substance that can form plaque on the walls of the arteries and keep the heart from getting the blood it needs.
Egan explains that there had been signals in early clinical trials of possible liver damage tied to statin use, so health care professionals were advised to regularly test their patients' liver enzyme levels. However, she says, such damage is rare, and the tests are not effective at predicting or preventing who will develop this rare side effect.
So FDA is now recommending that liver enzyme tests be performed before statin treatment begins and then as needed if there are symptoms of liver damage.
Reports of Memory Loss
FDA has been investigating reports of cognitive impairment from statin use for several years. The agency has reviewed databases that record reports of bad reactions to drugs and statin clinical trials that included assessments of cognitive function.
The reports about memory loss, forgetfulness and confusion span all statin products and all age groups. Egan says these experiences are rare but that those affected often report feeling “fuzzy” or unfocused in their thinking.
In general, the symptoms were not serious and were reversible within a few weeks after the patient stopped using the statin. Some people affected in this way had been taking the medicine for a day; others had been taking it for years.
What should patients do if they fear that statin use could be clouding their thinking? “Talk to your health care professional,” Egan says. “Don't stop taking the medication; the consequences to your heart could be far greater.”
The Risk of Diabetes
Diabetes occurs because of defects in the body's ability to produce or use insulin—a hormone needed to convert food into energy. If the pancreas doesn't make enough insulin or if cells do not respond appropriately to insulin, blood sugar levels in the blood get too high, which can lead to serious health problems.
A small increased risk of raised blood sugar levels and the development of Type 2 diabetes have been reported with the use of statins.
“Clearly we think that the heart benefit of statins outweighs this small increased risk,” says Egan. But what this means for patients taking statins and the health care professionals prescribing them is that blood-sugar levels may need to be assessed after instituting statin therapy,” she says.
The Potential for Muscle Damage
Some drugs interact with statins in a way that increases the risk of muscle injury called myopathy, characterized by unexplained muscle weakness or pain. Egan explains that some new drugs are broken down (metabolized) through the same pathways in the body that statins follow. This increases both the amount of statin in the blood and the risk of muscle injury.
FDA is revising the drug label for Lovastatin to clarify the risk of myopathy. The label will reflect what drugs should not be taken at the same time, and the maximum lovastatin dose if it is not possible to avoid use of those other drugs.
Patients and health care professionals should report negative side effects from statin use to FDA's MedWatch Adverse Event Reporting Program.
This article appears on FDA's Consumer Update page, which features the latest on all FDA-regulated products.
February 27, 2011