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The FDA said terbutaline injections, which are used to help pregnant women avoid preterm labor, will carry a boxed warning.

Injections should not be administered for longer than three days "because of the potential for serious maternal heart problems and death," the agency said.

The FDA also advised clinicians not to prescribe the pill version for this indication because of similar risks. [18 Feb 2011, USA TODAY; PFLI PharmFacts E-News Update, 18Feb11]