It actually means that you can use it without (automatic) liability. I doubt the two industries work off the same liabilities lists; it could well be that it is now illegal for use in animals -- it wouldn't surprise me if it became illegal for use in animals before it became illegal for use in humans.
It was doubtless developed to replace Stilbestrol in clamping down the uterus after birth because of the eventual problems that arose from using Stilbestrol to prevent premature labor and which ultimately was causing cancer in the adult daughters of those pregnancies (at least); I believe it's been replaced by a dose of Pitocin instead. I believe that evolved into using Pitocin to stimulate (and control) labor at a level higher than is good for the baby, and I think (like levels of mercury in the body) there may be no safe level when baby's still on board. I can tell you from two experiences with it that it makes for a very hard labor depending on the dosage (by drip, constantly variable) and that I saw oddities with both those babies during their growing up years. Even in the VERY highly functioning child we saw the inability to connect cause-and-effect in ideation that seemed normal in our two non-Pitocin-influenced children; that seemed to mitigate nicely with age, thank God. But that inability to connect cause and effect is almost central to autism, so I really do see that child as having been a "closet autistic" who gradually (but dramatically) improved over time.