Everyone's uterus is different and tolerates different levels of drugs. I was actually augmented with Marisa, my labour stalled at 5cms. I had my waters broken, there was mec so they put the drip up right away. I felt like I was levitating in pain, tears and swearing, so obviously my uterus was very sensitive to it. I don't think I needed as high dose as I was given. But they like to pump it up every half hour... and like my client this week, she got into labour quickly and was having 4 contractions in 10 minutes which is not normal for 1.5cms. So she had to put up with those contrax for hours until they found it wasn't doing anything... then put in the epi and pumped up the drip... she couldn't feel it but the baby could! Got stressed and was sectioned.