This research study is being conducted at over 12 pregnancy research centers in the US. The study will compare an investigational treatment with a placebo (a treatment without medication). Neither the investigators nor the patients in the trial will know which treatment has been assigned. All study medications will be given vaginally once a day. Treatment will begin before pregnancy week 23 and will continue until the end of pregnancy week 36.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Frequency of delivery <=32 weeks
Timeframe: 18 weeks gestation through delivery