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A possible carcinogen found in some blood pressure and heartburn pills has been detected in a widely used diabetes medicine, prompting health officials in Singapore to recall three drugs and European regulators to ask manufacturers to test their medicines.

The Health Sciences Authority in Singapore announced that traces of NDMA were found in some metformin pills above acceptable levels and began what it described as a precautionary measure to recall three of the 46 marketed pills that were tested. Metformin is used to control high blood sugar levels in people with Type 2 diabetes.

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