By Pat Anson, Editor

The old cliché about a doctor telling you to “take two aspirin and call me in the morning” isn’t such great advice after all. Especially for seniors aged 75 and older.

A daily dose of aspirin has long been recommended as a way to prevent a heart attack or stroke. But British researchers at the University of Oxford say the blood thinning effects of aspirin substantially raise the risk of gastrointestinal bleeding as patients grow older.

Their study, published in The Lancet medical journal, estimates that aspirin causes over 3,000 deaths in the U.K. annually.

“We have known for some time that aspirin increases the risk of bleeding for elderly patients. But our new study gives us a much clearer understanding of the size of the increased risk and of the severity and consequences of bleeds,” said lead author Professor Peter Rothwell.

“Previous studies have shown there is a clear benefit of short term anti-platelet treatment following a heart attack or stroke. But our findings raise questions about the balance of risk and benefit of long-term daily aspirin use in people aged 75 or over.”

Rothwell and his colleagues followed over 3,100 patients for 10 years who were prescribed a daily aspirin after a heart attack or stroke. For the patients under 65, the annual rate of bleeding severe enough to require hospitalization was about 1.5 percent. For patients aged 75-84, the annual rate rose to 3.5 percent and for patients over 85 it was 5 percent.

The researchers are not recommending that seniors stop taking aspirin. But they suggest that a proton-pump inhibitor – heartburn drugs – be prescribed along with aspirin to reduce the risk of bleeding.  They estimate that proton-pump inhibitors (PPIs) could reduce upper gastrointestinal bleeding by as much as 90% in patients receiving long-term aspirin treatment.

“While there is some evidence that PPIs might have some small long-term risks, this study shows that the risk of bleeding without them at older ages is high, and the consequences significant,” said Rothwell.

About half of adults aged 75 or older in the U.S. and Europe take aspirin or another anti-platelet drug daily .