Quoting 2 Baby Girls:" No idea. Have you tried googling it?"
Quoting Moses.:" I have no experience with the progesterone. However, I was dilated at 22 weeks with my oldest, and contracting. ... [snip!] ... me on procardia. At 30 weeks I was already to a 3. But, at 36 weeks 5 days I was still at just a 3 and I had to be induced "
Quoting P Pickle Pants:" It strengthens the cervix to keep it firm and can weaken contractions and keeps the placenta from starting ... [snip!] ... the placenta from starting to detach. I was on progesterone suppositories from 2-14 weeks and I start injections next week."