Overview Nifedipine Treatment in Preterm Labor Status: Withdrawn Trial end date: 2013-07-01 Target enrollment: Participant gender: Summary This is a study for pregnant women who have been diagnosed with Threatened Preterm Labor. The principal aim of this study is to compare the efficacy and safety of Nifedipine treatment versus Atosiban treatment over these patients' newborn babies. Phase: Phase 3 Details Lead Sponsor: Hospital Clinico Universitario de SantiagoCollaborator: Fundación Ramón DomínguezTreatments: AtosibanNifedipineVasotocin