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ONE day former astronaut Duane Graveline came back from a walk and failed to recognise his wife. He blamed this temporary bout of amnesia on the drug Lipitor, which he had been taking for several weeks.

Doctors dismissed his fears, but six weeks after he started taking the drug again he suffered another bout of amnesia. This time he could not remember anything after high school, not even his children.

Graveline is one of a growing number of people who say they have suffered from amnesia and other nervous-system side effects after taking statins, the cholesterol-lowering drugs being prescribed to millions of people at risk of heart disease. And now a few researchers are starting to believe their claims.

Beatrice Golomb at the University of California, San Diego, who is studying the effects of statins on cognition and mood, says she has documented at least 100 cases of memory problems that might be due to statins, including 30 cases of transient amnesia. "It's probably fairly rare," she says.

But with tens of millions of people taking the drugs worldwide, such problems could still affect thousands of patients. One of the reasons Golomb thinks statins are to blame is that in more than half the cases of amnesia, people suffered a second episode, a far higher relapse rate than normal.

Around 60 accounts of memory problems after taking statins were also found by a team from Duke University in North Carolina, who analysed the Medwatch database of drug side effects (Pharmacotherapy, vol 23, p 871). In some cases the patients' memory problems returned only when they resumed taking statins.

This "re-challenge effect" is considered to at least hint at a causal relationship between a drug and a side effect. Though statins are generally considered very safe, it would not be surprising if they affect neural function. The drugs block the synthesis of cholesterol, a key ingredient in cell membranes.

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Contact: Claire Bowles
claire.bowles@rbi.co.uk
44-207-331-2751
New Scientist
3-Dec-2003


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