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New study may explain Vioxx side effects
August 28, 2007Vioxx and related pain medications were taken off the market in 2004 because they caused dangerous heart problems in some people. A group of scientists, led by Timothy Hla at the University of Connecticut, may now have figured out how these drugs trigger these life-threatening side-effects. The new study will be published online in the The Journal of Experimental Medicine on August 27.
The target of these drugs is an enzyme called COX-2, which is produced in response to infection or injury and releases pain- and fever-inducing byproducts. Thus blocking COX-2 reduces pain. But blocking Cox-2 in mice, according to the new study, also stimulated the production of a protein called tissue factor, or TF, which initiates blood clotting. As heart attacks and strokes are often triggered by blood clots, it is possible that the production of TF is in part responsible for the drug's adverse side-effects in humans.
In the drug-treated mice, the high levels of TF in the blood were countered by administering TF-reducing drugs. Thus it is theoretically possible to treat people safely with Vioxx and other Cox-2 inhibitors if existing TF-blocking drugs are given simultaneously.
Journal of Experimental Medicine
Journal of Experimental Medicine
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Popular Arthritis Drug May Disrupt Heart Rhythm, UB Research Finds
Celebrex, a popular arthritis drug that blocks pain by inhibiting an enzyme known as COX-2, has been shown in laboratory studies to induce arrhythmia, or irregular beating of the heart, via a novel pathway unrelated to its COX-2 inhibition.
FDA petition would protect public from dangerous drugs
In a petition filed today with the U.S. Food and Drug Administration, an international coalition of scientists and doctors seeks to compel the agency to stem the flood of dangerous drugs reaching American consumers by mandating the use of scientifically superior non-animal testing methods when those alternatives exist.
K-State researcher examining why common anti-inflammatory drugs harm intestines
New versions of drugs like buffered aspirin and Vioxx could produce fewer harmful side effects thanks to research being done at Kansas State University's College of Veterinary Medicine.
Combining NSAIDs with chemotherapy, radiation may improve cancer treatment
Until recently, nonsteroidal anti-inflammatory drugs (NSAIDs) like aspirin and celecoxib (sold as Celebrex), were being hailed as promising cancer prevention drugs.
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