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The other two drugs commonly used in the treatment, fenfluramine and dexfenfluramine, were withdrawn from the marke t.

Then, in 1997, two popular medications, the drugs fenfluramine and dexfenfluramine, were linked to cardiovascular problems and removed from the market.

It and a similar drug called dexfenfluramine were withdrawn from the market in 1997 after they were found to damage heart valves.

The company's other drug, Redux, also contained a related chemical dexfenfluramine and was also taken off the market in 1997.

When fed to monkeys, dexfenfluramine can destroy neurons.