Repeated or lengthy use — longer than three hours — of general anesthetic and sedation drugs may harm the developing brains of fetuses and children younger than 3 years old, the U.S. Food and Drug Administration warned Wednesday.

After reviewing the latest published studies, the agency announced that these warnings need to be added to the labels of these drugs.

The agency also issued a Drug Safety Communication to inform health care providers, parents and caregivers of the potential danger.

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