Asthma and emphysema are airway problems that can be treated with terbutaline sulfate (Brethine®). Preterm labor, however, is another condition that can also be treated with the medication. Because terbutaline can cause muscles in the uterus to relax, it can be used "off-label" to help delay preterm labor. However, the drug is not licensed for this use -- and there are a number of risks associated with terbutaline and pregnancy. Mothers may experience pulmonary edema or irregularly heart rhythms, while infants may experience high insulin levels or heart problems.
(Click Terbutaline and Preterm Labor for the full eMedTV article. This article provides more information on how terbutaline works to delay preterm labor and also lists potential side effects that may occur if the medication is administered for this "off-label" use.)