A majority of federal health experts has voted to keep the controversial diabetes pill Avandia on the market despite evidence that it increases the risk of heart attack.

A panel of Food and Drug Administration advisers voted 20-12 against withdrawing GlaxoSmithKline's once-blockbuster drug. Panelists who voted to keep the drug on the market were split between several options, including adding new warning labels and restricting use of the drug.

The Food and Drug Administration has convened the panel to help untangle reams of conflicting data over whether the GlaxoSmithKline drug increases heart risks.

Despite an earlier vote that Avandia increases heart risks, panelists said the evidence wasn't strong enough to remove it from the market.