Progesterone vaginal gel for the reduction of recurrent preterm birth: primary results from a randomized, double‐blind, placebo‐controlled trial

Prophylactic treatment with vaginal progesterone did not reduce the frequency of recurrent preterm birth (</= 32 weeks) in women with a history of spontaneous preterm birth. The effect of progesterone administration in patients at high risk for preterm delivery as determined by methods other than history alone (e.g. sonographic cervical length) requires further investigation.