What is the main effect of magnesium sulfate during labor?

Magnesium sulfate is primarily used during labor to prevent seizures, particularly in cases of severe preeclampsia or eclampsia. This medication acts as a central nervous system depressant, which can help to stabilize the mother's condition by reducing neuronal excitability and muscle contraction. Its anticonvulsant properties are crucial for protecting women who may be at risk for seizures due to high blood pressure and associated complications.

While magnesium sulfate may have other effects in the context of labor, such as some muscle relaxation, its main role is firmly related to seizure prevention. The use of magnesium sulfate in this context is a key management strategy, helping to ensure both maternal and fetal safety during the labor process.