Food and Drug Administration (FDA) advisors met for a heated three-day
meeting to discuss the safety of the widely used painkillers Celebrex,
Bextra and Vioxx--and decide on recommendations for their future
use. The three drugs, all members of the COX-2 inhibitors drug class,
have come into question after studies linked them to heart risks.
In September 2004, Vioxx was pulled from the market by its maker,
Merck, after a study found that Vioxx doubled the risk of heart
attacks and strokes. Another study found that high doses of Pfizer's
Celebrex more than tripled the risk of heart problems.
Dr. David Graham, the assistant
director of the FDA Office of Drug safety spoke to the panel and
testified that using Vioxx would risk hundreds to thousands of heart
attacks in older men. Specifically, he said that as few as 400 or
as many as 10,800 additional heart attacks could occur in men aged
65 to 74 at low doses of the drug.
Previously, top FDA officials had forbidden Graham to discuss a
pair of large studies with yet unpublished information that related
directly to the drugs' safety. However, he did end up being able
to present "what he thought was important to present"
at the meeting.
Graham attributed the range in heart attack risk to the fact that
patients in clinical trials are typically healthier than those in
the "real world." The people who actually take Vioxx and
other COX-2 inhibitors are likely to be in their 60s, have other
health issues and may already be at an increased risk of heart attack.
Therefore, the risks of Vioxx may be underestimated, he said.
Other interesting points made at the meeting:
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Dr. Ned S. Braunstein, senior director of Merck Research Laboratories,
believes the heart risks apply not just to Vioxx but to the
entire class of COX-2 inhibitors.
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A panel member accused Pfizer of hiding data.
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Panel member Dr. Curt Furberg of Wake Forest University said
he was troubled by inconsistencies in Pfizer's briefing document
and wondered how much the company's presentations could be trusted
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Dr. Garret A. FitzGerald of the University of Pennsylvania
described his years of research to uncover how COX-2 drugs affect
the "stickiness" of the blood and the likelihood that
a person could have a heart attack or stroke. He noted that
lower doses of the drugs would not eliminate the risks.
At the meeting's conclusion, the panel voted to advise the FDA
that Celebrex, Bextra and Vioxx do indeed cause "worrisome"
heart problems but do not need to be banned from the market. The
vote was unanimous, but with narrow margins when it came to Bextra
and Vioxx.
Panel members recommended that the FDA:
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Place detailed warnings of heart risks on the drugs’ labels
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Ban consumer advertising for the drugs
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Require a guide describing the drugs’ risks be given with
each prescription
The FDA is not required to follow the advice of the panel, but
typically it does.
Before the heart risks were disclosed, Celebrex, Bextra and Vioxx
had combined sales of $6 billion a year. It's expected that sales
will rise again since the panel did not vote to ban the drugs from
the market, but likely not to the same level as before.
In 2004, Celebrex sales reached $3.3 billion, while Bextra sales
reached $1.3 billion. Sales for both drugs have fallen by about
half.
New
York Times
February 19, 2005
Yahoo
News February 17, 2005
USA
Today February 12, 2005
Dr. Mercola's
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