Tocolysis for Preterm Labor

Participants randomized to this arm will receive a loading dose of 6gms intravenously followed by a maintenance dose of 2-4gm/hr, per physician discretion, until uterine quiescence is achieved. The Magnesium Sulfate dosage is then titrated down until discontinued per physician discretion.

Participants randomized to receive nifedipine will receive an initial 30mg loading dose, then 10 - 20mg q 4 - 6 hours as needed, per physician discretion, until uterine quiescence is achieved.

Participants randomized to receive indomethacin will receive an initial 100mg per rectum X1, may repeat x1, and then 25 - 50mg orally every 6 hours over 48 hours as needed per physician discretion until uterine quiescence has been achieved.