The U.S. Food and Drug Administration announced today that Baxter Healthcare Corporation has temporarily stopped manufacturing multiple-dose vials of the injectable blood-thinning drug heparin due to reports of serious allergic reactions and hypotension (low blood pressure) in patients who receive high "bolus" doses of the drug.

Serious reactions to the drug have included difficulty breathing, nausea, vomiting, excessive sweating, and rapidly falling blood pressure that can lead to life-threatening shock. Four people have died after receiving heparin, although the relationship to the drug is unclear.

Heparin sodium is derived from pig intestines and has been marketed in the United States since the 1930s. Millions of patients benefit from the intravenous administration of this drug every year to avoid potentially life-threatening blood clots in the veins, arteries, and lungs.

"FDA concurs with Baxter's decision to halt manufacture of heparin sodium in multiple-dose vials," said Janet Woodcock, M.D., FDA's deputy commissioner for scientific and medical programs, chief medical officer, and acting director of its Center for Drug Evaluation and Research. "FDA is vigorously investigating to determine the root cause of these serious reactions associated with the use of heparin made by Baxter. In the meantime, patients and health care professionals who cannot obtain alternative sources of heparin should use caution in administering any Baxter multiple-dose vials that remain."

Heparin is commonly used before certain types of surgery, including coronary artery bypass graft surgery, and in kidney patients before they undergo dialysis. In some situations, heparin treatment is initiated using a high bolus dose given directly into the bloodstream (intravenously) over a short period of time, usually less than one hour. The reported adverse events occurred in patients who were given heparin in this form of administration. There are many other uses of heparin involving lower doses or administration over a longer period of time; adverse events have not been seen with those uses.

About 350 adverse events associated with the Baxter product have been reported since the end of last year compared to less than 100 reports in 2007. Most of the events have taken place at hemodialysis centers, almost exclusively involving patients receiving a bolus dose – which is a high dose administered over a short time. While most of the reports involve multiple-dose vials, several cases include patients who received a bolus dose after their health care professional combined heparin from single-dose vials.

The Missouri Department of Health and Senior Services first notified the Centers for Disease Control and Prevention (CDC) in January of several severe allergic-type reactions to heparin that occurred at a single pediatric hospital beginning in November. The CDC in turn alerted FDA and Baxter, prompting the company's voluntary recall of nine lots of heparin on Jan. 17.

Since then, FDA has learned of adverse events that extend beyond the recalled lots and involve patients receiving heparin for other purposes besides hemodialysis. Recent cases have included patients undergoing cardiac surgery and a specialized blood cell treatment known as photopheresis.

Over one million multiple-dose vials of heparin are sold per month in the United States; half of the vials are manufactured by Baxter of Deerfield, Ill. FDA is currently investigating whether similar events have been seen with other heparin manufacturers.

Physicians, dialysis center staff and health care providers are advised to use an alternate source of heparin or another blood-thinning drug when possible. When only Baxter product is available:

Any allergic-type reaction to heparin infusion should be reported to FDA's MedWatch Program by phone at 800-FDA-1088, by fax at 800-FDA-0178, by mail at MedWatch, HF-2, FDA, 5600 Fishers Lane, Rockville, M.D. 20852-9787, or on the MedWatch Web site at www.fda.gov/medwatch.

As of January 1, 2008, manufacturers of methadone hydrochloride tablets 40 mg (dispersible) have voluntarily agreed to restrict distribution of this formulation to only those facilities authorized for detoxification and maintenance treatment of opioid addiction, and hospitals. Manufacturers will instruct their wholesale distributors to discontinue supplying this formulation to any facility not meeting the above criteria. Effective January 7,2008 McKesson Corporation will comply with the voluntary request and distribute Methadone 40 mg (dispersible) only to those facilities authorized for detoxification and maintenance treatment of opioid addiction, and hospitals.

Methadone is a long-lasting opioid medication used in the treatment of pain and narcotic addiction. The 5mg and 10 mg formulations indicated for the treatment of pain will continue to be available to all authorized registrants, including retail pharmacies. The 40 mg methadone formulation is indicated for the detoxification and maintenance treatment of opioid addiction. The 40 mg strength is not FDA approved for use in the management of pain. Thus, the distribution and availability of the 40 mg formulation will be limited to registrants in only those settings using the 40 mg formulation for the appropriate indication.

The DEA and pharmaceutical industry agree that the reported increase in methadone-related adverse events merits action and further agree to a united effort to assure that methadone is properly distributed, consistent with its approved uses. Industry and the federal entities involved commit to monitor the progress of this initiative.

If you have any questions or desire any further clarification, contact your account manager or your McKesson servicing distribution center.

Baxter

December 13, 2007

Dear Baxter Valued Customer:

This letter is to inform you that on September 14, 2007 Baxter Healthcare Corporation
discontinued the manufacturing of the select heparin codes included in this notification letter.
Effective immediately the select codes shall be deleted from all applicable G.P.O. agreements
and individual contracts per normal procedure. The select heparin codes are as follows:

Due to the number of distribution channels which stock these select codes, inventory may continue to be available beyond the notification date of this letter. Please consult with your designated Distributor/Wholesaler provider as to the best product alternative for each of these codes. We ask that you forward this information to the appropriate departments within your facilities, or in the case of Wholesalers/Distributors that you notify your customers directly.

Should you have any questions concerning this notification letter, please contact your local Baxter pharmacy specialist or your local GPO representative. If any of the codes are not applicable please disregard.

Tom Progar
Senior Director,
Marketing Operations
Medication Delivery U.S. Region Baxter Healthcare Corporation Inc.