Final answer:
After discontinuing intravenous magnesium sulfate for preterm labor, Terbutaline is typically prescribed as an oral medication to continue the tocolytic effect and prevent premature contractions at home.
Step-by-step explanation:
When intravenous magnesium sulfate is discontinued after being used to treat preterm labor, the oral drug that is commonly prescribed for at-home continuation of the tocolytic effect is Terbutaline. This medication is used to relax the uterus and prevent further contractions that could lead to premature delivery.
As the pregnancy advances, hormonal shifts can make the uterus more sensitive to stimuli that promote contractions, which tocolytics like terbutaline aim to mitigate.