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Study of six women: only negligible amount of glyburide found in breast milk.(Obstetrics)

OB GYN News

| June 01, 2004 | Mahoney, Diana | COPYRIGHT 2004 International Medical News Group. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

MIAMI BEACH -- Only a negligible amount of glyburide was found in the breast milk of six women who were taking the drug to treat type 2 diabetes, Dr. Denice Feig reported.

Investigators analyzed the breast milk of the women, who had taken a single 5-mg dose of the oral hypoglycemic. They determined that the extent of transfer was below the level of detection, she said in a poster presentation at the annual meeting of the American Society for Clinical Pharmacology and Therapeutics.

The usual glyburide dose is 5 mg twice daily. Some patients take less, and some take up to 10 mg twice daily, said Dr. Feig, head of the Diabetes and Endocrinology in Pregnancy Program at Mount Sinai/University Health Network in Toronto.

At present, women are advised not to breast-feed while on oral hypoglycemics, but that recommendation reflects a lack of evidence-based data regarding the extent of transfer of these drugs into breast milk.

"There are not a lot of data out there. The recommendation is based largely on an old study using tolbutamide--an old sulfonylurea--that showed crossing into breast milk. We also know that the old sulfonylureas crossed the placenta," Dr. Feig said. "Ours is the first study [of breast milk] looking at glyburide, which has also been shown not to cross the placenta."

To determine the extent of glyburide transfer. ...

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