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VIOXX
RECALL INFORMATION
Merck & Co. has removed its blockbuster arthritis drug
Vioxx from the market worldwide because new data from a clinical
trial found an increased risk of heart attack and stroke.
Merck decided to remove the drug from the market
after data from the trial showed an increased risk of heart
attack, stroke, blood clots and other cardiovascular complications.
The data
comes from a three-year study aimed at showing that Vioxx
at a 25 milligram dose prevents recurrence of polyps in the
colon and rectum. The trial was stopped after Merck discovered
the higher heart risk compared to patients taking dummy pills.
Before
the withdrawal of Vioxx, the FDA announced that patients taking
Vioxx have a 50 percent greater chance of heart attacks and
sudden cardiac death. The study, presented at an epidemiologists
conference, also found patients taking the highest recommended
daily dosage of Vioxx had three times the risk of heart attack
and sudden cardiac death as those not taking standard painkillers.
The popular
and heavily advertised arthritis drugs Vioxx and Celebrex
have been linked by researchers to an increase in the risk
of blood clots, heart attacks and strokes.The study from the
Cleveland Clinic appeared in the Journal of the American Medical
Association and was based on an analysis of previous clinical
trials. Celebrex and Vioxx are projected to produce U.S. sales
greater than $6 billion this year.
In a study
of more than 8,000 patients that compared the COX-2 inhibitor
rofecoxib Vioxx) with the traditional NSAID naproxen, the
risk of cardiovascular problems, including heart attack,chest
pain related to heart disease, stroke, sudden death and blood
clots, was more than two times higher in the rofecoxib group
than in the naproxen group.
Vioxx
like Celebrex is classified as and known as COX-2 inhibitors,
or coxibs. COX-2 inhibitors, like older drugs such as ibuprofen
and naproxen, are nonsteroidal anti-inflammatory drugs, or
NSAIDs. Older NSAIDs reduce inflammation by blocking an enzyme
called COX-2, but they also block another enzyme called COX-1.
This enzyme helps protect the lining of the stomach, so blocking
OX-2 can cause stomach irritation. COX-2 inhibitors only block
COX-2, leaving the stomach-protecting COX-1 alone.
In 2000
Merck spent $160.8 million on direct to consumer Vioxx marketing.
Many people are familiar with Vioxx television advertisements
featuring the famous figure skater Dorothy Hamill. Sid Wolfe,
a physician and director of the Health Research Group of the
advocacy group Public Citizen in Washington, D.C. said "Dorothy
Hamill doesn't tell people they have a four times higher risk
of a heart attack on Vioxx."
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