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U.S. Health Officials Announce New Heparin Formula
Date:10/1/2009

Potency of blood thinner is cut as FDA alerts doctors to the safety change

THURSDAY, Oct. 1 (HealthDay News) -- U.S. health officials on Thursday announced new manufacturing standards for the widely used blood-thinner heparin that will decrease the drug's potency by about 10 percent.

The reformulation is largely a response to contaminated heparin that came from China in 2007-2008 and caused hundreds of severe reactions and 200 deaths among U.S. patients, most of whom were on kidney dialysis.

While the new standards take effect Oct. 1, the four U.S. manufacturers of heparin have already started making units under the new guidelines, which will make it easier to spot impurities.

But the U.S. Food and Drug Administration (FDA) has asked them to delay shipment of the new formula until Oct. 8 to allow health-care providers to come up to speed on the changes.

The decrease in potency is likely to affect some clinical situations more than others, Dr. John K. Jenkins, director of the Office of New Drugs at the FDA's Center for Drug Evaluation and Research (CDER), said at a news conference.

For example, he explained, when the blood thinner is "administered as a bolus intravenous dose and an immediate anti-coagulant effect is clinically important," health-care providers should consider the decrease in potency when making decisions about the dosage needed.

"The change in potency is expected to be less clinically significant when administered subcutaneously," Jenkins added.

The FDA will be conducting tests to determine the exact clinical impact of the lower potency, officials said.

The changes do not affect labeling of the blood thinner, which is derived from pig intestines and used to prevent blood clots during certain kinds of surgery, and by people requiring kidney dialysis.

While the transition is taking place, both old and new versions of heparin will be avai
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