The nonbinding recommendation to the Food and Drug Administration came on a majority vote by the panel. The tally was not immediately available.
"We're being asked today to take a very Draconian action based on studies that have very significant weaknesses and are inadequate for us to make that kind of decision," said Rebecca Killion, a diabetic, who was the panel's patient representative.
However, in an earlier 20-3 vote, the panelists said that available data show the drug does increase heart risks. Panelists said the drug's warning label should be updated and additional study was necessary.
Earlier, FDA scientist Dr. David Graham told the joint panel of experts that the drug's heart risks, combined with its lack of unique short-term benefits in helping diabetics control blood sugar, meant continued sales were not justified.
The manufacturer, GlaxoSmithKline PLC, argued that there is no increased risk, citing its own analyses of studies of Avandia, also called rosiglitazone.
"The number of myocardial infarctions is small, the data are inconsistent, and there is no overall evidence rosiglitazone is different from any other oral antidiabetes agents," said Dr. Ronald Krall, the company's senior vice president and chief medical officer.
The FDA convened the experts to consider whether Avandia should be restricted to use in select patients and branded with prominent warnings or removed altogether from sale.
Previously, the FDA had said information from dozens of studies pointed to an increased risk of heart attack.
The FDA is not required to follow the advice of its advisory committees but usually does.
About 1 million Americans with Type 2 diabetes use Avandia to control blood sugar by increasing the body's sensitivity to insulin. That sort of treatment has long been presumed to lessen heart risks already associated with the disease, which is linked to obesity. News that Avandia might increase those risks would represent a "serious limitation" of the drug's benefit, according to the FDA.
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