May 31, 2013 12:16 PM by Michael Handler; KSBY News
FDA officials say Magnesium Sulfate should not be used to prevent preterm contractions for more than a week.
Magnesium is only approved to prevent seizures in pregnant women with high blood pressure, but is sometimes used off-label to stop pre-term labor.
The FDA received reports of an increased risk for fractures in babies exposed to the drug in the womb. These newborns were also more likely to have bone abnormalities. The women in the FDA studies took the drug for nine weeks on average.
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