Is magnesium sulfate safe for long-term use?

In general, magnesium sulfate should be used for short-term treatment. As a laxative, it should not be used for longer than one week at a time. If you do not experience relief within this period, stop taking it and seek medical attention. In cases of low magnesium levels, this medication is typically given until the levels of magnesium in a person's body have stabilized. In these cases, the drug is safely used for long-term treatment.

Magnesium sulfate is also used to stop pre-term labor. The U.S. Food and Drug Administration says magnesium sulfate shouldn't be used for more than 5-7 days for this purpose, because prolonged use may cause low calcium levels and bone problems in the developing baby. 

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