wrote Steven Galson, head of the agency's drug division.

Galson added that the agency had worked with Abbott to educate doctors about appropriate patients and to change the drug's label, adding the need to monitor patients' blood pressure.

Meridia is an appetite suppressant approved in 72 countries to treat obese adults along with dieting, according to the FDA. It can cause side effects ranging from headaches and constipation to higher blood pressure and a faster heart rate.

Public Citizen's Health Research Group Director Sidney Wolfe said the 50 heart-related deaths reported since the drug's approval still warrant its removal. While Meridia use has dropped, "many people are still getting this dangerous but not very effective drug," said Wolfe, whose group petitioned for the ban in 2002 and again in 2003.

Abbott, in a statement, criticized Public Citizen's analysis and said Meridia had repeatedly been proven safe and effective.

Long term effects of the drug on obesity-related death are still unknown, according to the drug's label.

Meridia is one of five approved drugs that FDA veteran scientist David Graham said should be scrutinized when he spoke at a congressional hearing last year.

On Wednesday, Graham said the FDA and the company were "relying on statistics" to keep the drug on the market. While studies show Meridia can help patients lose some pounds, the loss is not enough to improve patients' health, he said.

"What's the health benefit of losing 15 pounds if you weigh 300 pounds? There is none," Graham said. Because of the side effects, he said a study he did three years ago showed most patients stayed on the drug for less than a month.